The window
period is brief, so probably her HIV
test would be positive if she were in the window
period when you had sex with her. But don't lean on her hard; if she is confident she doesn't have HIV, you can also be confident about it.
Feel free to return with a comment to tell me your HIV test results. While you're at it, have a urine test for chlamydia and gonorrhea. You can expect negative results on all of them.