is she a Mother or child?

I was floored to hear a Mother was harassing my daughter about not inviting her daughter to her Birthday party. I guess it was started the following day. Then it escalated into leaving her mean comments on her message board on her computer. Then she was talking to my daughters friends about how horrible is and she is a B*tch for not inviting her daughter. I was taking a bath and my daughter came running to the bathroom crying for me to come to her room. She showed me her computer screen and I was SHOCKED to what I read. It was a nasty mean message to my daughter. Telling her she is a snotty B*tch and she is obviously not a TRUE friend to her daughter other wise she would of been invited. it went on and on about nonsense. she just would not let up. I wish I kept it to show you what she wrote. I felt my claws coming out and I was so angry at this Mother for this. I wanted so bad to write back and put her in her place. but being an Adult I didn't ( even though I really wanted to) Once I talked to my daughter about this she told me who's mother it was. I was not surprised when she told me who it was. She was a few years behind me in High school. I am not even sure if she completed High School to be honest. she was one of those Mother you would see down town at midnight pushing a baby stroller. I recall a night I went to my Boyfriends ( my now husband) house and she was there trying to " ROMANCE" his room mate...( Excuse me while I gag!) anyway this woman really has no life at all. She just moved out of her boyfriends house and now lives in a run down apt. She is a nurse and works the night sift and leaves her 2 little ones 12 &10 home alone all night while she works. My daughter was just telling me that she was yelling at a Boy at a Soccer Game because he wouldn't kiss her daughter. ( HUH? why would a mother encourage this type of behavior at such a young age?) I guess she also brings her daughter out to dance Clubs with her on weekends to go Guy Shopping together? Good Grief what is this Woman doing to her children? She must of forgotten she is a Parent not a Best friend. I often see her at stores and around town...I am not sure how I will react when I will see her. I may just ignore her or maybe I will mention the party issue to her like adults. This is not something I expected from a friends parent. I always tell my daughter. "If you wont say it to your friends face. you should never write it for your friend to read". I doubt this Mother would have the guts to say this to my daughters face. Maybe she should think before she writes! also my daughter told me that she said a few explicit things to and around my daughter? what is up with that? what kind of example is she setting with this horrible behavior? I am so happy that my daughter can and does come to me when things are not right or needs a motherly advice... Anyway...Needless to say...My daughter WILL NOT go over there...if her friend wants to come here that is fine at least I Know what they are doing and that they are being taken care of. Some people have no freaking clue!
Being a parent is not always Fun and games.