First Post, She just Left, Very unsure

[bravo61]

You don't tell her you show her. You stop entertaining her conversations or whatever else.

If you have to say something (& you probably will cause she'll ask why you are being mean by ignoring her) you can simply say "W, this is not what I wanted and moving forward you should know that I will treat you w/respect we are not friends." She'll press you & say she doesn't understand why(she's trying to eliminate her guilt with this) simply ask if she could be friends if position was reversed or friends don't treat each this way & then walk away & don't be drawn into a fight(what she desperately wants).

For B, that's why you need to consult an atty.
My two cents.