Ask yourself, is she moving away, not moving, or moving towards you, atm...?
THEN, ask yourself if the text will harm, have no effect, or help the sitch...?
THEN... carry on...
Hi Kaffe -- hope you had a good weekend!
Regarding your comment: That's the quandary for me. I'd like to think the message will help the sitch, or at the very least, lessen exam anxiety. What she definitely isn't doing is moving towards me, so it's either moving away or is stagnant. Would saying "Good luck" be likened to something "You look nice today"?. If so, then I won't message her. Or, will she see it more as a pleasantry which she could ignore (I don't mind that), or reply with a simple "Thx" (for example).
