Hi Sisabel. I can relate to this.

Next time she or someone else refuses to change a toxic behavior towards you, briefly let her know that you do not appreciate it.

You let her know one time, and if she does it again, you go no contact with her. If she keeps coming back asking why you are ignoring her, you remind her that you've already had this conversation with her.

This way, you will always have a reference point to work with; whereas if you never confront her, she will keep nagging you for an explanation as to why you are avoiding her.

If she is not a safe person to be alone with, bring someone along for your protection, as well as your witness (Remember that when you confront unsafe people, they may lie about the confrontation too).