1. She cannot stand her, so why not?
2. WSB guy was there and it gives her the opportunity to either break things off with Jason or stick by him if he shows her she is a priority.
If Jason shows her he is serious about their romance and finally does something about her desire to be higher on his priority list--she'd tell him EXACTLY what she is involved in. She already told him that she's not letting him in on that because he'll leave her high and dry if Carly or Sonny need something. At least the last time he did come back to her the same night.