In all honesty, I'm sitting here making these posts because I am rationalizing and I desperately want someone to say, "It's okay to interact with her a little bit. It's okay to call."
It IS okay to interact and it IS okay to call.
The key is to keep off ALL pressure. Women are attracted to confident men. A confident man calls when HE wants to call.
Remember.. You CAN call. You CAN interact. It is okay.
Just keep off all of the pressure. It is important to gauge whether she feels pressure from you. Keep it to small talk. Be happy. Those types of things. If you do call, please understand that you can also put yourself into a backslide by doing or saying the wrong things.
Try not to tell yourself that you "can't do this or can't do that" it puts too much pressure on yourself. You can call anytime you choose to. Confident people don't analyze and worry or stew over every little thing. They call if they want to call. The key is to figure out if calling her is so important that you are willing to risk that she feels it is pressure and sets the relationship back further.