I think she weighed more than 130 lbs at some point, but I don't think she was originally overweight, unless she had been starving herself for a very long time. In her booking photo from January (about 3 months prior to her death), she looks relatively slim. Even 20 pounds more on a woman of her estimated height is still average to thin. My opinion on the XL men's clothing is that it was easier to layer for warmth, pretty common among homeless people. Also, it may have been easier to find in thrift stores or wherever than women's size Tall.
Also as far as the size 9 shoe .For me sometimes I can wear a 6 1/2 shoe or depending on the shoe a 7 ( sometimes wide sometimes medium) and I agree that a homeless person or anyone trying to keep warm usually does layer and to do that it takes the one on the top being at least 1-2 sizes larger sometimes more.
The one thing I would guess is consistent no matter age or weight is the height. If she went missing as a teen maybe she grew a bit taller since she went missing ? Hard to say .
FWIW, I'd be surprised if she actually starved to death. I suspect she died of dehydration ("no drink"), which will generally kill you faster.
To me, she is someone who had an undiagnosed or untreated issue like bipolar disorder, schizophrenia, or something. She obviously once took good care of herself (the acne meds, possible highlights, the dental work). She either disappeared and was reported missing or had been struggling with mental illness long enough that her loved ones had simply lost touch or given up on communicating with her.
I really wish they would release photos of her belongings, particularly her writings. Someone might be able to recognize her handwriting.