Hi Keith
Don't be hard on yourself. Generally when fostering it takes 3-4 days to learn the basics (don't wake me in the middle of the night, outside is for peeing, you eat when I give you the bowl, leave the cat alone, etc basics). If they have no basic training it is good to start straight away but they are still learning you are the new pack so give her afew days, she will get it

I use praise, treats and ignore bad behaviour. Like if they sit I don't treat them (they are training me to feed on their que), but if I ask them to sit then I treat them (I gave the command).
The other thing I find is if they do play it takes awhile for them to relax to the point they will play. Think my last foster it took her 12 days before I saw her playing like a dog.
All the doggies Ive fostered I can say Ive walked in the house with one dog, and two weeks later they are definitely a different dog.
One other thing is I generally do take them for a walk for afew days - all walking and training is done at home. This is to get them used to their new Den area and with all the stress of having a new pack, I don't want to introduce more stress.
good luck and can't wait to hear how she goes over the next couple of weeks. It will happen, give it abit of time