Do I just forgive or be careful about who I consider my friend?

My husband was turning 50 years old. He suggested going to gamble for his birthday, and I was thinking that sounds great. However, my neighbor convinced me I should have a party for him. I thought about it thinking you only turn 50 once. Well, I had the party and my neighbor, friend for 17 years, would not associate with us at all. She proceeded to invite friends of hers and entertained them at her house. It was so obvious that my aunts and my brother-in-law and my husband's sister found it kind of rude. So I was not the only one that noticed. Now she comes over to my house, four days later, and says, haven't seen you much, everything alright? I said "yea, overall, I have a sinus headache, other than that I am fine." She proceeds to talk to me like nothing happened. She knows all my family as we have been neighbors for 17 years and she is the one that said how much fun we would all have. We spend almost every Friday night together, her boyfriend, myself, her and my husband. Do I forgive her for being rude and not even associating with us during my husband's party? She is not shy, she was obviously rude for others to notice.