As soon as your daughter knew who these texts were coming from, she should have completely disengaged. It's just like how the phone company tells you to handle obscene phone calls. You hang up.

Now they are going to contact her again. As long as they can get a response out of her, they are going to continue contacting her. Their intentions are evil. They've learned the trick of getting their foot in the door by hiding behind anonymity. They are just like those callers who say they are from Microsoft Security and want to help you get rid of malware from your computer.

Giving your daughter long explanations is not getting through to her. Tell her to not engage with them, or with anyone whose identity she is not sure of. Then you have to let go a bit. I know it's frustrating to you to see her get pulled back into this nastiness, but the ball is in her court. She will follow your prudent advice, or she will get sucker-punched by these girls again.

You need to put a bit less energy into trying to control this situation. You can't. Give your daughter a bit more room to think for herself. Yes, I agree with everything you delineated. These girls are utterly diabolical. They target your daughter because she is naiive. Giving in to them was not an instance of your daughter beung "kind." She was following the path of least resistance because she is inclined to do that under pressure. The girls know that, and they use that knowledge against her. They are shrewd and clever. They are bored and sadistic. This is how they entertain themselves. They goad each other on.

Maybe it would be good for your daughter to discuss this with someone other than you. You're doing your best. But here she is back communucating with them again, and they are not done with her . . . horrible as that is to contemplate. I think she might benefit from professional counseling. If you're able to arrange that (can be expensive) - do not quiz her about her therapy sessions. She needs to have better boundaries. She even needs boundaries between herself and you. That may be hard for you to hear because you love her very much. She needs to learn more autonomy. That starts at home.

I'm sorry your daughter has to be preyed upon by such awful individuals. These 2 girls are budding, young monsters. A kind person, like your daughter, needs to learn that some persons are simply bad people out to harm others. They are best completely avoided. She will meet more like that. They're out there.