Hmmm, the first relationship that comes to mind is Naomi and Ruth. But after that I can't really think of any gal relationships that are described in the Bible. I would imagine that the Mary's were friends. You could probably make a case for Mary and Martha, but then again, they're sisters. Deborah and Jael were contemporary heroes, but I can't remember anything about a friendship between them.
So I'm dying to know, what were the other two relationships? :-)