What the heck did i do wrong? my gf is mad at me for something...?

ok yesterday me and her had a good day sort of. there were like two situations where im not sure went so well. well me and her were arguing/flirting about who was better at what. and she was like "im better at comebacks" and im like "w/e i am." then shes like "mhmm sure w/e" so then i was like "that was a great comeback lol" and then she was like "=O ***". this was all through IMs. and i was like "what?" and she was like "i wasnt even trying to make a comeback and u just had to go and be all smart". then i was like "i meant it in a joking kind of way. not a mean way. im sry though. ill take it back." then she was like "thank you". then we got on ps3 today and we were playing call of duty 4. she was hosting a match with like 10 ppl. it was a 5 vs 5. and me and her were arguing/flirting about like the simplest things just because we wanted to and one of the things we argued about was about this one guy whose name was (MEX)CDChivas88 or something. and i was like "that mexican killed me!" and she was like "how do u kno hes mexican?" i was like "i just do...dont question it lol". (we had mics and were voice chatting while playing). and i was like "lol y do u make the biggest deals out of the smallest things?" and she was like "maybe i just like to". then she went on and on about how i didnt kno he was mexican and i was saying he was and so on. so later she got off of ps3 and we get on aim. and since she signed off randomly and didnt tell us y i asked her y she got off and she was like "my dad was being an ***, he was all pissy and made me get off ps3. he gave me some stupid lecture about how im a brat". and i was just talking to her about it and just trying to keep conversation going and she was like "u overthink things too much" and i remembered how she kind of over thought things with the mexican guy earlier so i was like "i seem to remember something about a mexican on cod4?" and then she logged out. i saw on myspace she was still online. she signed off of myspace about 45 mins after she signed out of aim. i can only think of two things that could have happened. 1. she is mad at me and thinks im being an *** because i said that and signed off or...2. she got caught staying up too late by her parents and had to get off. but then idk y she signed off myspace like 45 mins later. do u think shes mad at me? did i say anything wrong?