I would suggest writing her a letter saying what's she's doing that is so disrespectful and puts you down so much, what you would like her to do instead and how you would like to be treated. Make it practical ie: no comments about nits, (dear god), no telling you to shut up etc.
Then, if you get a nasty response (which is quite possible since she tells lies by saying you've fallen out with other family members) simply stop responding to her. Don't contact her and if she comes to the door, simply say 'I'd like to have a good relationship with you, but that now is up to you. When you're willing to have that, please come round".
And then shut the door. (Consider putting a chain on it).
I would also get in touch with the people she'd engineered fall-outs with and explain the situatoin.
You - will - get tantrums and screaming most likely. You need to talk this over with your husband and work out how she is likely to respond, and how you will handle it. Maybe even yoru children too. They have to be hurting, seeing how you are talked to by her.
This is absolutely not ok way for her to deal with her daughter. You deserve a great deal better, sadly she's not giving it to you so you will have to lean on your husband and stand up for yoruself and enforce respectful treatment.