Wait I didn't know you were both 27, lol wtf man, she invited you over, drunk with you, let you in her bed and you just wanted to snuggle all night?. No wonder why she just wanted to sleep, she got bored of waiting for you to make a real move on her, she might not want you as a boyfriend but she might have let you smash her from behind whilst pulling her hair.
If thats the case it is just awkward for her now because she might think you want a serious relationship when all she wanted was some dick, but now she might be scared of hurting you if she is decent and thinks you want more than a shag, thus she wont risk another boring night of snuggling.
Sorry to say this man but regardless of what is going on in her mind, I thought you were a lot younger than 27 from what you wrote, you sound inexperienced, stop putting pussy on a pedastool, go and find some easy lays, ugly ones, fatties, whatever, have fun, get some practice, get comfortable and confident in your own skin.