whats there not to get, u just spoke to her at a flat only once and yet u are making out with her constantly as if u have been going on a steady relationship for months , Things were moving way too fast for her. duh she got caught up in the emotions of new lust at first but then figuratively sobered up and pull back.
may be on that flat party she was not in her wits that’s why she allowed you and when she cam back in her senses she took that night as a mistake .. may be she did not want to do that but because of drink she got that addiction
She probably just wanted to have fun and maybe thought you were coming on too strong??? I wouldn’t lose sleep over it tho.
maye she wanted a good time?