Since you indicate patient, this would imply you work in the medical field. What is the protocol for your particular medical facility regarding testing after an occupational exposure such as this?
As previously mentioned (and depending on the particular testing method used), the recommendation for continued testing after a needle stick from a known HIV positive individual is, at the very least, four month and often six month testing for most medical facilities.
If her last unprotected sexual encounter prior to yours was 7 weeks ago (and she tested at 7 weeks) and you tested at 16 days then it's unlikely either of these tests can be considered conclusive.
Have her retest at 12 weeks to learn her HIV status. And, it would also be a good idea for both to consider testing for other STD's beside HIV (if this hasn't been done already). There are several that are far more easy to transmit than this viral based STD.