My T is also going to be taking breaks throughout the summer - I feel your pain! I have HUGE abandonment fears and often wonder "Is she taking a break just to get away from ME?" But, the worlds isn't all about *me*. There a million other reasons she's taking a break (ie: time with her husband/child/grandchildren).
I look at my life and realize how tiring it is to listen to people a lot, and definitely understand the need for a break if you listen to people's painful lives 8 hours 5 days a week. That's a lot to handle.
I also look at it as: She's doing the healthy, loving thing I wish my family did. She's spending time with her kid/grand kids, and it shows me there really ARE people like that that exist in the world.
I'm sure you you find when she comes back she's refreshed and ready to help you again - not abandoning you.