I defeated her solo, on alpha difficulty, my army of dinos was composed of 16 megatheriums (~25-30k hp, 1,500% damage), Two daedodons (~20k hp and 5500 Hunger), A yuty (~18k health, 990 stamina, 2000% damage) and a rex ( ~30k hp and 2000% damage). As soon as I entered the arena, I just sent my dinos to swarm her, I was riding one of the daedodons and left my yutys auto courage on, even with the daedodons healing I still suffered some casualties, 2-3 megatheriums died, as well as my Yuty, but my yuty died at around less than half her hp bar, I didnt need to use my master craft shoftgun very much, or my rockets, my riot armor did break though so I suggest to bring a spare, that and some healing supplies.