What is the longest I should wait for her to call me back?

I called her on Tuesday evening after meeting her at a party on Saturday and getting her number. She seemed interested because she went all the way to her bag which was on a couch about 15 feet away, just to get her phone when I just pulled out my phone and said, “aw man my batteries are dead” (in other words, I didn’t even ask for her number, I just pulled out my phone).

I left a brief message saying, “It’s [my name], I have a question to ask you, just gimme a call back at [my number].”

It’s now Wed. late night and I’m wondering why she hasn’t called me back yet, and what to do if she doesn’t call me back by tomorrow to maximize whatever chances are left with her.. should I call (and when), should I add her on facebook, or should I text at some point?