question about a cookie!

Hi,

yesterday I looked at my girlfriends computer because she had a problem with a file she deleted. so I wanted to find it. anyway.  as I was looking for it on her computer I came though the C:\document and setting\user profile\resent folder and there was a lnk file to a cookie in the c:\document and setting\userprofile\cookie folder and the modify date on the lnk file was yesterday. I went to the cookie folder but she had deleted her history in interent explorer. so only offline cached files was to find there..

i usaly dont care about that.. but the cookie is to a sex dating site. so I am a bit consern about it. maby she is cheating on me..

so the question is. have she been to that site yesterday if there is a lnk to that cookie in the recent folder?

I wille way to confront her to I am sure about whats going on., so I ask some pros first :)