Look under her hair in the back - you may have to pull it up a little bit to see markings... or... bottom of foot, or middle of her back... These dolls were really popular in the 1950s & 1960s... some did not have markings.
We checked it all over. We have sold dolls before AND bought them. But I doubled checked the places you said and there are no markings. Sorry. I bought it in an antique store