After Fire, Amanda Bynes on Mental Health Hold

All right. Stay tuned. Turning now to amanda bynes. Ordered to psych ya the resting after starting a fire in a neighbor's driveway. Abbie boudreau with more on what amanda bynes is doing. What's on... See More

All right. Stay tuned. Turning now to amanda bynes. Ordered to psych ya the resting after starting a fire in a neighbor's driveway. Abbie boudreau with more on what amanda bynes is doing. What's on fire? It's a small piece of cloth. And it a gasoline tank. Reporter: The former child star, witnesses say, set fire to this driveway on monday night. I saw this girl laying down with her left pant leg on fire. When I look at her, amanda bynes. She was, like, really frantic. Like, she wanted to get out of there. And she's like, my dog has been burned. Reporter: He says bynes tried hailing a cab to get away. I was like, don't take her. I don't know what's going on with her at all. Do not let her in the car. Reporter: Deputies responded to the scene and talked to bynes. But did not charge her with a crime. It determined that she met the criteria of 5150. That's a psychiatric hold. The patients can be taken involuntarily from where they are and put in a setting where they are evaluated by special specialists in a hospital. Psychiatrists and a multidisciplinary team will evaluate her. Reporter: Bynes was on a mental health hold where she can be observed up to 72 hours. The "hairspray" actress has been in and out of court. Sparking hair-raising headlines with her colorful wigs and bizarre behavior. I think amanda has been in the public so long, that there's a twisted part of her that thinks this attention is good. Reporter: Even taking to twitter. Calling miley cyrus ugly and jenny McCarthy an old lady. This could be a catalyst for significant change in her life. Reporter: For "good morning america," abbie boudreau, abc news, los angeles.