Transcript for Robin Roberts Interview with Sister Sally-Ann
Everywhere I go, robin, people ask me, how is your sister? How are you doing? It's not a journey that goes like this. It's a journey that zigzags. And there's complications and things like that. But I feel good. I feel stronger, every day. When did you know that the transplant was working? The doctors were telling me, we're not going to tell you if it's working. Yotell us how you feel. And ten days later, I woke up. Where have y'all been? That's when I knew. Reporter: Two sisters on a journey, that has taught them and us about facing tough times with gratitude and grace. When I recently went back into the hospital, I was emotionally down. And then, I just started changing the way I think. Because you're here for them to check up on you. It's a tuneup. I have felt the prayers. I have felt people lifting me up. I put no small measure on that is the reason that I'm doing as well as I am. Reporter: That is robin's joy. And friday, another big day. Her birthday. That's the next great milestone. My great doctor told my recently, I'm going to get to go to early bird specials. I'm going to get to go out. Be around people. Reporter: That is robin's joy. And friday, another big day. Her birthday. This is a birthday gift from mom and from me. And we'd be singing to you ♪ happy birthday to ya happy birthday to ya ♪ ♪ happy birthday ♪ and mom would want you to have that. Oh, sally-ann. This is really beautiful. I feel as though mom waited until she was sure that you would have what you need because it was the day after I donated the stem cells that mom went home. And this is the first time that I have been through any traumatic experience without her physically being here. And it just weighed on me. But I do believe that it was her way of making sure, that all of her children could be taken care of. And I said this. It was a -- you know, she was there when I took my first breath. And what an honor it was to there when she took her lost. Her mom's wisdom and love, guiding robin through a challenge we know she'll overcome. I look at it as a clean slate. And how many people can say, at this point in their lives, that they get a do-over. They get a chance to start again? And that's how I feel. We're all a little bit stronger. A little bit stronger than we think. And that's all we need. And that is the robin we know. We're joined, now, by a key member of team robin, gail robos. Thanks for coming back. Let's talk about what put robin back in the hospital. She called it a tune-up. There's a billion germs out there. And since we're little kids, we are fighting them off. Sometimes we are fighting an infection. And sometimes the immune system takes care of it for us before we know anything. But those bugs hang around. She didn't really feel it. She didn't feel anything. That's the thing. We monitor these sneaky germs very carefully. That's why the posttransplant monitoring is so important. We check and we can pick up tiny amounts of a virus before the patient knows anything. And if we stomp it out quickly before it turns into an infection, it is much easier. Robin has such a great attitude. But this has to be emotionally tough for her. It's so hard to go back in the hospital. Think of the joy we saw on tv when she left. She was so h beut of there. And it's hard not to worry when you go back. Am I going to be okay? How long is this going to take? And she rallied so quickly. She's been recovering very, very strongly. As robin progresses and comes into more contact with the outside the world, should she expect more bugs like this? The bugs are out there. And she is not ready to be in crowds. Is not ready to be surrounded. Although she's going to be out for her early-bird special, the point is to go when there's not tons of people around. She's coming up on the key day, day 100, very soon. We don't want to be married to a calendar. They are important milestones. But they don't necessarily mean, everything will be fine on a specific day. And the monitoring continues. We have to be vigilant.R let the guard down. She's doing really, really well. But it's not about the calendar. It's about watching her and making sure her systems are ready to fight off the whole world. So far, so good, getting stronger every day. Absolutely. You can see it by looking at her. Dr. Roboz, thank you very much. Isn't that great, guys? Fantastic. As emotional as it is, it's also so empowering to see her gaining strength. See her looking better and feeling better and feeling things again. We're the early bird special, robin. I'm amazed by the attitude. And the comment she made, that we're all stronger than we think. That says it all. I don't know anybody stronger. It's an honor. It's such an honor to be just a tiny, little part of her life. Amen. I think it's so good for everybody to see this update, those eyes and that smile,
This transcript has been automatically generated and may not be 100% accurate.