I need a biual or to answer this question please!?

okay so this girl (Anna) who im quite good mates with is a , i have no problems with it (She came out about 2 years ago) but today me and 12 of my best girl mates (including her) went bowling, we were all laughing and joking together because this one girl who nobody likes invited herself and we were making jokes about her (i admit sometimes i can be abit of a b*tch but the reason we dont like her is a long story so please dont go on about me being mean) Anna said everytime we said something mean she would jokingly slap us, anyways the bowling continued and about half an hour later i said something mean and Anna slapped me, my other friend said "did you just slap her bum?" and Anna replied "haha i wish" then everyone laughed and Anna went so red and went to take her turn of bowling. I felt abit uncomfortable but everyone else just laughed it off. Do you think that she meant it just jokingly or actually wanted to slap my bum? She went red afterwards do you think that meant anything? I want a /bis point of view because you will know. Thanks :) x