Stress can cause big problems like this, and can make a women question just about everything in her life including relationships. It sounds like she has a lot going on right now and for that reason giving her the space she needs is very important.
At this point I would just go ahead and start moving on, if in the end things settle down for her then maybe you guys can work it out. But waiting around to see what happens isn't completely healthy either.
She asked to end it, so you have to respect her choice and assume that it is in fact over and start moving on. If this is just stress and something she may change her mind about then it will happen when it happens. I would say give her a month or so and shoot her a email or a phone call and see how she is doing. If things have settled down then maybe a date would fall in line, if not no harm no foul since you have already started to move on.
I know it seems like a bad thing to do, but had you tried to fight it then you may have caused further harm. The last thing you want to do is cause her any more stress.
As for the call, no feel free to call her now if you like. Explain to her that you love her, but respect her choices and will give her space if that is what she wants. Let her know that when things settle down if she changes her mind to give you a call. Then wait at least 30 days before calling her.