No, social services aren't going to tell her to stop gobbing off at your child.
Just ignore her. She's a knob and she won't change.
Report her to the landlord for antisocial behaviour every time she does something, if she's a social housing tenant, a private one won't care.
If she threatens you or physically attacks you, call the police and report the crime.
She can't "get your DD in trouble" when DD has done nothing wrong, so ignore all that bullshit, she's just trying to intimidate you and DD because she's never evolved beyond the playground age emotionally herself.
All it is, is now her DC isn't playing with the next door neighbor (your DD) she's having to do more parenting, entertain her own DC, have them hanging around the house more often, listen to them complaining about having no friends (probably because she's raised a little shit that goes around hitting everyone). And she CBA with any of it. So she's pissed off and taking it out on you/DD, who she sees as the cause of this situation for not tolerating her DC's crap behaviour.
Stop stressing about her and get on with your life as if she wasn't there.