I would take it as a sign that they weren't going to sign with me. I would think that now it has been a few days since Christmas/New Years and she would put the care of her child somewhere on her to do list. If she still hasn't contacted then maybe she has decided to sign somewhere else.

I think contacting more than once might seem like you are desperate.

Hopefully she will still contact you ...but even then I would wonder about this family and how little consideration they put towards signing a quality provider in a timely manner. It should be a priority for them rather than waiting for the last minute.