"Relate your ask to the group at large by using "we" instead of "I." So I might say, "We grew our traffic by X percent this quarter and it was awesome; I brought in X percent of that." It also helps when women make it about collaboration: This is not a battle - you want to work together with the other person to get to a place you are both happy with - so remind them you're trying to come to a mutually beneficial agreement."
