I just worked out that she'd be there on the same day y'all stalked Martin, never thought of looking on another day. I guess it's the day after the ones Martin came around for your convenience.
I don't think she appears again until future updates... possibly. If there's going to be events connected to both Martin routes (friend/not-friend) then I assume "friend" will be him introducing you to people, possibly Vanessa or the "Not-friend" route could be her getting in touch with you again and rewarding you for letting her know what a douche he is. All supposition and I look forward to find out, eventually, how that's going to unwind...