This thread has failed quite well.
My girlfriends mum wanted me around the place since I first met her, so you failed as a cool bro, as well as failing to provide a cool story, bro.
And if you can't wake up right after a night of probably being sozzled out of your head, you should take some manning up lessons. Not even her asking any questions? Come on man.
My honest thoughts whilst reading the OP was that you had a very paranoid and insecure episode and your emotions were rather screwed up. Still under the influence of alcohol much? Seriously. If you've ended with her, then fine, you're moving on at your slow womanly place, if not, well done trolling everyone.
Edit: Heck, try getting in contact with her. Who knows what it could have been. Talking don't hurt. If she acts like you're just crawling back then you know its fo sho and just leave it.