A bit of urine around the pussy shouldn't stink like rotten fish or be able to stink up the entire room by having sex.

For that to happen, she's either got Bacterial Vaginosis (BV) or a yeast infection. BV is not an STI, it's just a condition that is brought on by a girl having multiple sex partners causing an imbalance in the bacteria population of her pussy. The smell from this is extremely "fishy" and defo will fill up an entire room with the same odour.

Yeast infection is an STI. I haven't personally experienced the smell from this but I gather from research that the smell would be ry different from what you get with BV.

The BV smell is unmistakeable. It's a very "blunt" pong that really hits you in the face. Fishy, but doesn't smell 100% like fish at the same time. It's just a very undesirable smell in general!