Susan2227,
Welcome to the forums dear Susan, and I'm so sorry to hear about this experience you've had with your partner's family friend. Thank you for sharing this with us, and I'm here to echo and expand on Grandy's advice.
You're justified in your feelings here. I can understand how upsetting it can feel to have somebody yell or get angry with you, and how it can make you feel less inclined to interact with the person again.
Often, there's a rational explanation for sudden outbursts like this, as it sounds to me like misplaced anger. Perhaps she was struggling with some other stressful events that day, and this was an expression of pent-up emotion from these other events. Of course, this doesn't justify yelling at somebody, not at all. But these kinds of solutions may help to explain behaviour like this.
Have you talked to your partner about how this friend's behaviour has affected you? If you haven't already, it may be a good idea to let them know that this situation has occurred, and that you're having reservations about putting yourself in that kind of situation again. Your partner may able to work through the situation with you, or at the very least, offer you some reassurance and support about how you're feeling.
I hope this is helpful advice, take care and please feel free to chat with us some more if you wish. We're here for you.
SB
