How do i tell her this.....please help?

alright so, i took a girl i like and her friend to a concert over the weekend. The girl's friend, Abby, was like all over me the whole time (we used to have a thing). So last night Abby started skyping with me. We played games just messing around, i was not being flirty at all. We started playing hangman (you type in a word and the other person has to guess it) so for words she put in "sweetheart", then put "sext" two times in a row so i was like thats dirty she put for a word the next time "dirtygirl" and put a wink face in the chat. So i was like yeahhh goodnight and swear to god accidentally put a winky face instead of a smiley. Ummm i want to tell the girl i like that this happened, but dont know if she would believe me, or if her friend would turn it on me and make it look like i was being like that to her. Please help me!!