It's Not Over 'Till It's Over

[Mimi00]

Continue to stay away from talk about her feelings bringing old memories/hurts up....instead keep making new feelings through your current positive interactions...she will talk about her feelings when she is ready.

What will you be doing with you S that you want to ask her to join you?
I say if you have something already planned (that you'll do with S with or without her) I don't think it would be horrible to tell her that she's welcome to come along (no expectations on your part)....but if you have nothing planned and you just want to ask her IF she wants to do something, I'd say don't do it...