Were women blacksmiths in the Middle Ages?

Answer:

no, women did not do that kind of work.

Answer:

Actually, yes there were women who were blacksmiths and ferriers in the Middle Ages, as medieval records show.

There are a couple links below that might be helpful about this, one to a related question on the things medieval women did, the other being a link to a Wikipedia article on horses in the Middle Ages, a section relating to women.