If she's still having skin problems from the burns this could be a cause of frequent shedding. Also if she was underfed and is now catching up in a well heated enclosure with good humidity and food she could be going through a growth spurt causing the shed. Are there any other skin problems? If not I wouldn't worry about that.
Is she feeding on f/t? My advice would be to keep her one a regular schedule with everyweek or even a bit longer. Regular feeding will put the weight on in a good way. Over feeding can cause more problems. I'd say just feed the right sized meal every 10 days.
Females can get bigger than males but still they can go anywhere from 3.5 to 5+ feet. I'd guess anywhere from a a year and half to who knows,,,in other words I couldn't really guess at the age.
Sounds like she's found a good home. Slow down on the feeding, check for any other skin problems and if you can send in some pics. Enjoy your girl!
