Mostly based on the photo she posted, how she is acting, and dressed. At least I didn’t pick an option where more was said than that. It maybe more openly said based on what option you picked. Also on the 2 option she seems legit concerned for Wade.
Also with game knowledge if you are on Ian/ Cindy path if the picture was posted you learn that stuff did happen but she denies it being full sex (if I am remember correctly). If you are 2 with her the picture is not taken and she said axel tried to do something but she rejected him. So if you want to connect the dots most likely something also happened between the two of them if she was not with you if the same picture was posted.