How can I stop my DC playing with other child

[Cherryade89]

I really don’t know what to do. My DC is in reception and is one of the youngest and smallest. She is always telling me this other child has pushed her or is calling her small and picking her up/being quite rough with her and telling her what to do. I’ve witnessed it myself at pick up time, she is treating her like she’s a doll and pulling/pushing her around. There has also been a biting incident which the teachers dealt with as it left a red mark and bruise on my DC. She also keeps telling my DC to run away from me and not to listen to me. She lives on my parents road and we bumped into them today after school. Her mum had gone inside and left her on the back playing. When she saw us she ran up and said ‘get away from your mummy and come with me’ and started pulling her. She then said ‘if you don’t come I will smack you in your mouth’. I said that’s not kind and we don’t say that to our friends. Her sister then came out and she started shouting at her sister calling her a fatty. She has also taught my DC a swear word. My DC wants to play with her and she still continues to be friends with her after all this. I’m very worried that she’s going to be influenced by this behaviour and I don’t want her playing with her anymore but I don’t know how to stop it

In a nutshell, you can't.

You can't influence who you child chooses to.play or interact with during school hours.

But you can big up other friendships (invite then round for playmates, etc), talk up other friends and talk to your child about positive and negative relationships

Talk to school about it, saying exactly what you've said here.
Also make sure your child doesn't interact with this one outside of school. Pick her up and take her in.
PP is wrong, you can stop it at this early age by involving school and physically preventing them spending any time together outside school. This is a very young age, so perfect timing to nip it in the bud.
You certainly don't want to be years down the line and unable to actively sort it out yourself.

Sounds like she's repeating how people speak at home, which is bad.

Slightly different but my DD had similar issue with a bit a pre school, I went and spoke to the parents and they were actually lovely but the school appeared not to be able to do anything so we removed her and put her in another one. The boy causing the problems went to the village school and was taken out and put in a aSEN School in year 1

In this situation if the school didn't act then I'd either complain to OFSTED or remove my child until it was sorted. This is bullying. Just because they're only small doesn't make it any less serious. We have wouldn't accept this behaviour from other adults nor would we expect older children to tolerate it so why should younger children be tormented?
I despise this dismissive attitude on bullying just because they're small.

You either talk to her teacher about it or talk to the parent and tell them that their DC is threatening violence etc to your child and you’re not OK with it. Simple.