Aw, that's really sad your father's dog is in that way.
Honestly, handling anxiety in pets, shouldn't really be so far removed from handling it in a person. The dog needs something to do to keep her mind occupied, and get her body moving, exercise is key, playing with her is key..
Make sure she can get a good hour long walk daily, and take some time to play fetch, or whatever kind of game she enjoys. I do this with my dog, and she is happier.. thing is, it's been getting hot now that it's summer, and she's wanted to go out less, so she hasn't been walking as much, and she seems to get a bit antsy not having expended that energy.
I'm not against medication though to help, if there is such a thing you can talk with your vet about.