Did you happen to run into some form of an AoE comp or even a bronzodia team comp?
Maybe she had a Sona, Amumu, Oriana, Malphite, Leona, Rakan. Any kind of AoE cc and damage?
AoE teamfight is strong especially in bronze.
Otherwise all she is is an ult bot and you can walk out of her ult.
In lane if you are caught dozing off she will get a nasty Q on you but
if you are awake and expecting her to do these things and you also don't set them up for her
you should survive her.
If you are in fact in bronze 5 do avoid AoE comps. They are easy to pull off and destroy people who are daydreaming.
EDIT: i think it was the game where she had a blitz ori galio and zac. That can be pretty nasty. They had a good team comp and your team didnt afaik, maybe you could splitpushed and sieged but with blitz and zac and all the aoe that game just looks too hard, it happens.