I hear you Penguinsing. The uncertainty and the what-ifs are very hard to endure. In my experience, they are harder to endure than hearing a firm answer I didn't want to hear.

As you have mentioned, there might be a good reason she didn't call back: wrong number. Please give her another try. Then at least you will know what's going on and you won't torture yourself with these uncertainties.

If her answer is no, she still might have some ideas for what you could try next.