It's not that her tits are too big, it's just that she has a weird body with the tits/because of the tits.
Her shoulders are wide as fuck, like twice the width of her hips. She probably has strong ass shoulder muscles from having to just stand up straight with them muthafuckas, like she does a deadlift every time she stands up. She covers her shoulders a lot with the hair so you don't see them.
She has strong shoulders but soft arms, which kinda give her that chubby look.
She looks short and her legs are kinda dumpy.
I know her back hurting because she always grabs her waist.
Her body wasn't made to hold them tits like that. It's like one side of the family brought huge ass tits, and the other side of her family brought a small frame built for some smaller tits, so she kind of won and lost in the genetic lottery.
She should try working out before she cuts them off. If she had cut arms, abs, legs and a stronger back, she would probably look and feel better.