Senior Foster Girl

Hello,
I don't think I have ever posted in the senior section. But I have just picked up a senior foster dog, and wanted to make sure I was doing right by her.
She is a 10 year old female GSD. She was flown in to Idaho from California just last night. The owner had lost their home due to the mortgage melt down. All rescues are full in that state and nobody wanted to think about a 10 year old dog in an open admission shelter. A breeder near me ended up getting the call for help and she contacted me and another rescuer near by to see if we had room.
I took her on because I love the seniors. I appreciate everything about them, and find them to be easy to live with and fairly easy to place in forever homes. Also, this girl has a hang up with other female dogs and needed to go to a foster home that didn't have any females at all. I just have males at this point, so my husband and I said yes.
The cool thing is that the dog community where this girl came from gathered donations to fly her up here, they paid for her health certificate/vet check prior to travel and they paid for two big bags of the senior formula of the food I feed my own crew. And they made sure she traveled with her own toys and personal belongings.
She is a spayed, retired schutzhund competitor. Seems to be in great shape for her age. She has the worn teeth of a dog that has done a lot of bite work in the past, and they could stand a good cleaning. She is a little stiff, but gets around great.
Her vet check prior to flying showed a low grade heart murmur. I will get her into my vet on Monday for blood work and a check of the murmur. If all checks out, I'll make her available for adoption in a few weeks after she has had a chance to settle down and relax from all these changes in her life. Of course, she will stay with us for as long as it takes to get placed.
I have had my own dogs on Eagle Pack Select Holistics and have loved the results. Even my picky eater with major food allergies does well on this food. As I said, the local breeder who had coordinated her flight up here had two big bags of food for her. So I am going to put her on the Eagle Pack Senior formula. She had been fed the Costco brand of lamb and rice in California. Do you all think she should do okay on the Eagle Pack? I didn't feed her at all last night, thinking that her tummy might be upset from the flight and all the excitement of travel. This morning I gave her 2 cups of the kibble, soaked in hot water and with a tablespoon of canned Solid Gold mixed in for taste. She ate happily. She had been fed 4 cups of soaked kibble just once a day in California. I don't like feeding just once a day, so I will give her 2 cups of the Eagle Pack kibble, soaked, with the Solid Gold to taste, 2 times a day.
Any advice about getting an older girl to settle in would be happily accepted! I really, really like this dog and feel so lucky to be able to help her.
Sheilah