Her test won't prove your status because of your previous unprotected vaginal.
If you have unprotected vaginal then you can get a conclusive test with a duo after 4 weeks, or any other test is conclusive after 3 months. So if you test neg now, that covers off the previous encounters, and she tests neg with a duo at least 4 weeks from her last unprotected vaginal or anal (before she did it with you) , then you're both neg. Or, if you don't trust her, wait 4 weeks and take a duo then let her know you're conclusively neg.