She most likely lied because she felt embarrassed about it OR didn't want you to feel hurt/get the wrong idea.
But I can see how discovering your partner's first lie can be pretty hurtful.
As for her not getting a chance to contact you, maybe she hasn't had the chance to get a phone yet or get access to the internet? I'd give her another day to settle in and then see what happens. Try not to over-analyze for the time being.