Bit of background - my DD and this girl have been friends for a couple of years. The girl's mother and I became very very good friends and met socially etc, many play dates at each other's houses.
Things changed 4 months ago when this girl turned on my DD. We are talking spitting, hitting, verbal abuse and isolation. I tried to approach the subject with my friend but she was having none of it and even though the school intervened and spoke to my friend about her DD's behaviour she still wouldn't believe it and subsequently we fell out. Very badly.
Since our falling out, I have been approached by some of the other school mums to say that my ex friend has been heard saying some quite unsavoury things about my DD. I didn't take much notice until I heard her with my own ears at a birthday party (she didn't realise I was stood behind her). She's also said some pretty awful things about me on social media.
Despite all this - the girl's have remained friends even though I've tried to encourage my DD to play with other children as something happens every week with this girl.
Here's my AIBU - literally every week I get asked by my DD if she can go to this girl's house for tea or can she go horseriding with her at the weekend etc. I don't feel comfortable letting my DD go to this girl's house with everything that the mum has said about her. My DD doesn't understand why I won't let her because of course I haven't told her that this woman has slagged her off! My DD is 4 if that's makes a difference.
WWYD? AIBU?