Thanks for the responses. The friend gets intestinal problems with dairy but claims it isn't lactose that is the problem. Although, I don't think she really ever tried lactaid. I suspect that she just doesn't want to go through the painful week or two to find out the real problem (fat, whey, casein, or lactose).
Dry milk is great for certain circumstances - baking without adding too much liquid, mixed drinks without diluting the other ingredients, and the fact that I rarely buy milk at its current price since I don't use it for much of anything. I buy real milk for ice cream and use it if I have it in other items. But otherwise, dry milk works just as well or better than real milk for my needs.
I'll look into Brioche.