Rachel,
You were not at the party to entertain her. If she felt uncomfortable, she is a big girl and had her own choice to excuse herself. It is a party, people DO mingle. SHE mentioned this 3 times, it is HER problem, NOT yours! Like you were supposed to cater to her needs? Please! Maybe she needs to expect less and get more!
I do not like people like that and I do NOT associate with them. (ie:victims) Like my neighbors last week, one of them approached me asking why I/hubby do not like them. It is NOT a matter of me liking them or not, I know how they are so I am indifferent. It is the past and whatever. The way they have treated us and the other neighbors next to them just instills a permanent distance I need to keep from these people. It is that fact that when we DID speak, there was always some "misunderstanding", issue or ridiculous retaliation we experienced from them. (like them hating our fence so they put charcoal briquettes under the wood fence while hot, leaving a raging campfire near our fence or when they called cops on the cable guy (3 times!) because he went into their yard on an utility easement and the cops TOLD them this was legal, or when the dead trees were cut down for our fence and we were supposed to split the wood and the bill the took ALL the wood and never paid us.) She denied doing any of it but who else would call the cops? or dump the hot briquettes? or not pay us for the the tree cutting and share the wood as agreed? They even were swearing at me the morning I was cleaning the fence construction mess when not even 12 hours before I had found out my grandmother passed away. She stood there in my face and denied the WHOLE thing! This is a person I cannot trust or wish to ever trust again. I do not hate her but this is someone I do not want in my life because I cannot trust her. (my husband feels the same) My husband and I just mind our own business. We do not say nothing to them because somehow it always ends up being some sort of issue, so it is not worth it. Sometimes no communication is better then trying to communicate with people that just are different. My mother in law is someone I really am not comfortable with...actually none of my sister inlaws are! I just do not get "stuck" alone with her. I do not get mad at my husband if he walks away, I too have a mouth, can and HAVE excused myself out of her presences. I learned that I will not care for all people, nor will they care for me and hat is AOK! I have the ability to excuse myself and walk away. I also can choose whom I associate with as well. You have that choice to! Do not let what she said bother you...SHE has the problem! You did GREAT!
Birthday party STRESS
Thank you 
schnauzermom I appreciate your compassion and understanding. I'm done with her and her behavior. She's not worth it, I don't feel like I'm ever rude to people and that I've never been anything to her. I would guess she must be pretty miserable most of time act that way. She mentioned it 3 times indeed, and everytime called me that same name. I was 
shocked. I didn't understand to it to be honest with you. I think she wanted me to do the party totally different and was upset with me for not doing it her way! She wanted it to be a suprise party and with a specific theme. I just did what I wanted, and ended up waiting till the last minute before deciding... We've had a lot going on and I wasn't entirely sure I even wanted to do it. But I did it because I knew it was important to him. oh well, explanations don't even matter. I just need to let it go and move on.
schnauzermom I appreciate your compassion and understanding. I'm done with her and her behavior. She's not worth it, I don't feel like I'm ever rude to people and that I've never been anything to her. I would guess she must be pretty miserable most of time act that way. She mentioned it 3 times indeed, and everytime called me that same name. I was shocked. I didn't understand to it to be honest with you. I think she wanted me to do the party totally different and was upset with me for not doing it her way! She wanted it to be a suprise party and with a specific theme. I just did what I wanted, and ended up waiting till the last minute before deciding... We've had a lot going on and I wasn't entirely sure I even wanted to do it. But I did it because I knew it was important to him. oh well, explanations don't even matter. I just need to let it go and move on.