Yes, she can't take down even if some random dude (if that dude is not mentally challenged and if he knows how to fight as an amateur on the street at least) has 30 pounds over her, let alone +50 pounds professional boxer, who can knock down people with ease.
Yes, I grappled before, weight is more important in wrestling than its in boxing / striking.
Look at how Floyd failed against an amateur Logan Paul, who had 35 pounds over him, and that's striking.
Weight importance in wrestling >>>>>>>>>>>> weight importance in striking/boxing, not even close.