If we are looking into mild supplements for a lady, then all the standart supplements will do just fine - creatine, whey protein, BCAA....you just need to make sure that you are getting high quality stuff. For instance, when choosing a protein product, you need to choose the one made with whey isolate, since it is the purest form of whey protein that has no lactose in it. This is important, since most protein products on the market are made with whey isolate - a much cheaper version of whey protein that does contain lactose. As for the creatine and BCAA, you need to get the products that will have the pure versions of these without unnecessary additives or sugars.
My wife uses whey protein called Isolation by N2BM, as well as BCAA GEAR and creatine Ancient Strength from the same company, since these are of very high quality for a decent price.