Parent verbally abusing me in playground

[Mumwhoneedsadvice]

Where to start..
My daughter is 6 and is in year 2.
Since reception she's formed a relationship with another little girl and it was always just the 2 of them. End of last year a new girl started and their 2 turned into 3. You know what they say 3's a crowd.
My daughter come home few months ago saying that the new girl was having a party but said to my daughter she wouldn't tell her who's going.. Which obviously upset my daughter when she found out the 2 of them had gone out for the day.
I told my daughter to rise above it all and play nicely..
Everyday the last 2-3 weeks my little girl has been so quiet and withdrawn at home.
She broke down after school and told me how nasty the new girl has been to her.
I don't believe everything a 6 year old says so I asked her teacher who advised all Ok so I left it.
Yesterday new girl come out in tears and her mum runs straight up to me and says "You want to sort her out". "I've had enough". She was shouting at me I front of the whole playground was so embarrassing. She wouldn't even let me talk to say actually my daughter has been crying all the time. My reply was "don't believe everything they say". She then said "Don't call my daughter a f** liar".
I messaged the lady as I had her on my social accounts as we previously knew of each other I put that we need to work together with the girls not argue and she never replied..
Today she argued with me twice in the end telling me to keep my daughter away from hers.
This lady was a bully in her school in her younger days I'm just a bit stuck what to do. I've tried to reason and work together but she refuses to listen. I don't want an argument every time I go on school run. I'm even considering moving her schools.

She thinks the shines out of her kids .... unfortunately they usually do.

go to the head. Mums will never, ever admit to their children's bad behaviour - believe me!

Update!!

I have only seen this lady once since we seem to be avoiding each other.
Anyway I still feel really on edge when I go to school I feel quite sick.
My daughter has been offered a place at a school on my road. Everyone is totally against me moving her as she's doing really well she's settled there. There argument is why move her schools over a silly mother.

I'm so unsure of what to do right now?

Without doubt you should go and speak to the head. Think if the head as the school manager, if they aren't given an opportunity to help a situation improve leaving disrupts your daughters education when there may be no reason to. I imagine they might ask to see you if you wish to move her anyway.

I wouldn't disrupt my daughter's education over a bullying mother. I would involve the school and if necessary the police.

The school know exactly what she's like. She shouted at you in front of the teacher? I guarantee the teacher will have been over this. She's a Jeremy Kyle parent. You tell the school to take a firm line on this or you will move your daughter. Shouting at you on school grounds is not acceptable. I feel sorry for her DD as she will probably end up moving again.

You're not 15 any more and neither is she. You don't have to tolerate this behaviour and she doesn't get to get away with it.

I spoke with with daughters teacher after school I told her that she's been offered a place at the school I couldn't believe the reaction...
She didn't even seem bothered it was like she was sticking up for the other girl because she's terrified of the mother. I was quite shocked really..
She was there when she was shouting at us both..

The fact that the teacher wasn't bothered despite witnessing the scene makes me think it's not a school I'd want my children in. We have a mum at our school who behaved worse than the one your dealing with. One day after school she screamed at me (in front of 4 year old dd) because ds1 had stuck up for younger boys her son was pushing around (of course she saw differently!) I went to the recently appointed head and she fully agreed with me. The mum was called into school for a meeting and banned from the playground for two days. Her behaviour has improved tremendously since then. I'd move my child if I were you.