Hey, this echos the previous posts, but.. you can't get sick from breathing the same air as her unless she was sick less than a few meters away from you in an open space (if she was sick in the bathroom and you didn't go in the bathroom you're in the clear). I just hope she washed her hands properly before touching doors and everything though, cause the virus might spread that way. Even if someone is sick close to you, the particles don't travel very far and don't stay airborne for long periods. My brother works in healthcare and he's been exposed to sick patients often and never actually caught it from them. I think it's more worrisome if someone living with you catches it because then they can contaminate almost all the surfaces in your home if they're not super careful with hygiene... then again I once managed to care for a boyfriend who had an sv and he wasn't the most careful person and I still didn't catch it even after spending two days at his place while he was sick. So you're not doomed, your exposure level was low.