She is definitely goal focused and driven, I will give her that hands down. She always accomplishes what she wants to how she wants to.
An underlying factor could be something to think about. Her father passed away when she was 9 and was a pro body builder.
Sexual assault or trauma? Never gave it a seconds thought, I would like to say that if it had happened she would tell me as we have always been open but you never know how people will react to things like that happening
No, a sudden onset in motivation to change her body
away from something you find attractive.
That she has not explained this means she doesn't want you or anyone else to know about the reason.
That's also down to a variety of reasons ranging from feeling unattractive as a girl, to feeling powerless during an attack or attempted attack.
Has someone asked her straight up?
Why have you changed your body?
What keeps you motivated to continue?
Why muscles instead of fitness?
Each answer may peel back a layer to eventually get to the core of the motivation/change.
P.S. Attempted/Sexual assault is often not reported for a variety of reasons.
Sorry, I am not pushing the rape angle... I am just trying to say, She is being
powerfully motivated to change her body. You need to check into the why's of it.