She should be fine medically. Female power lifter usually are fat but also have significant amount of muscle still. So basically body fat % is main thing that determines one's health.
Well, petals of reincarnation had a loli hitler (but doesn't remember ww2). She wasn't evil, but was the enemy of the Protagonist till death and never actually fought the mc.
I looked at a Google translated version of last few chapters and the story seems like shit going to get crazy over next few chapters until the ending. Also it feels slightly rushed by not the worst.
I think the manga might've met the axe by looking at raws since it looks like it completed or Google translator being shit like usual and the series is still ongoing.
Edit: yeah completed at chapter 27.