You see her three times a week? I totally understand how that would create an issue when she is gone a week.

Have you talked with her about what else you should do while she is gone? Leave a voice mail?
Your feelings are valid. If you need her....you need her. That's just where you are right now. Do you think she will be understanding if you vm her while she is gone? I should think she would expect it.

I'm sorry it's so rough. I really empathize with you.