Sorry to hear you are having trouble.
Kids can say some pretty mean things and do some horrible things. It's hard not to react but sometimes that's what they are after.
I would tell her that if she doesn't pick up her behaviour that your special outings together may have to change. You cannot get all the housework done as you are making it hard with your behaviour so might have to stay home this week to do it. Sometimes this type consequence is enough to break the habit and she will see she is missing out on your time together.
Maybe give her a job that is special for her only but again if she plays up she loses the privilege.

You are doing a great job bringing up your girls on your own.