But this week, it was Leah's turn for a bit of uplifting when Mandisa came to UCSF Benioff Children's Hospital Oakland to meet the petite songstress for the first time, sing and play.
"Y'all, I'm with somebody very special right now," Mandisa said during a Facebook Live video she shared with fans Wednesday. "This is amazing. It's bringing me so much joy."
On Wednesday, Mandisa also held a private concert at Leah's church, participated in a discussion about Be the Match Registry and later joined her. The event helped raise $3,600 for Be the Match.
During the discussion, Lindsey Chapman-Carroll, Leah’s mother, shared that Tuesday would be the girl's 430th day spent in the hospital and away from her home and family.
Chapman-Carroll said that she and Leah had a goal of signing up 430 new marrow donors by Tuesday. So far, about 400 people have signed up in Leah's honor.
"It's just so cool. God is in every detail. ... People have really stepped up their registering game," Chapman-Carroll said.