I saw the documentaries on her. She was known as the Half-Ton Killer because she took the fall for her toddler nephew's death. Said she accidentally killed him by rolling over on top of him and crushing him :/ There was a whole thing about how she would even get in the court room/serve time in prison. It was found that her piece of shit ham sister and her man were abusing the kid, and he died from the sister hitting him the head with a hairbrush. Sis hopped the border, and Mayra copped to the murder because she felt guilty about not protecting the kids (that one, and I think two others). Still fucked up to let sis get away, though. TLC gave her the Dr Now special, and like you said, she lost the weight and got custody of the two other kids.