she could've had before you did, had no idea because she was asymptomatic, and gave it to you. she could be testing negative on the pcr test now because the virus already left her and she isn't taking an antibody test to find out if she's already had it
or she does have it right now, is asymptomatic, and she's just in the incubation period portion of having it where you can be taking the pcr test, still have covid, but show up negative.
unless you're getting both an antibody test and a pcr test every single day, its honestly impossible to know where you actually stand with covid
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