Was this just a drunken thing or am i reading into it to far?

me and a friend got drunk saterday night (nothing new we do it most weekends) and we always talk daily about... well anything really. but on this night, we kissed a few times... yeah okay. but since then we havnt talked at all and when we have seen eachother we havnt talked properly. Just wanted from a girls perspective why she might be closed from me now? (im 20 shes 28) so there is an age gap issue which might be a factor? and yes i attempted to talk to her .