When we brought our beagle home at 7 weeks she was the same, didnt seem to want to eat much for the first few days. But dont worry, it didnt last long! shes nearly 11 weeks now and she practically inhales the food, we're thinking of getting something with bigger pieces so that she'll have to chew more.
On the issue of milk, our breeder told us to use goats milk as he said that was the closest to bitches milk.
We also give her a raw egg whisked up at tea time which she loves.
It is a bit worrying, but if you put the food and water down every meal time, she'll take it when she settles in a bit.