Thanks to everyone for their perspective. I've managed to take a couple of steps back and take a couple of deep breaths. It has helped greatly and I was right to trust my husband that he would address the situation with her and he did. We have had no further instances (thus far) of the behavior I complained about previously.
She does live with us and it was something I voted for and still feel positively about, but like anything else it has its adjustment period. She and I do get along fairly well, but there is still room for improvement there.
Thanks again for your words of advice!