C.B.
you can be honest AND nice: "hey i just thought i'd give you one more call, i know it's a crazy time of year but it's odd that i haven't heard back from you. i hope that everything is okay with you and your family, well just wanted to see how you're doing... i don't want to keep bothering you so give me a call if you want. Thanks!"
that way you're expressing concern (in case something IS wrong), but you're also letting her know in a nice way that you won't be calling her anymore so the ball is in her court if she wants to stay in touch. that's all i would do...and then let it go.