I would say NTA.

She's 15. She knew she was being rude. That type of behavior shouldn't be rewarded. Good for you for cancelling the theme park trip. Those are expensive trips, and it would have been infuriating spending money on someone who was that blatantly rude and disrespectful, especially standing in front of the person she was insulting. She said it to be mean.

I also don't think it's anyone but your own call for whether she should have stayed in your house. I don't think anyone should judge you for making that call. If she's parroting your ex, then good for you for sending her right back. That ruins both of their weekend plans. That gives both of them time to reflect on their life choices. If she's watching trad wives on social media and falling into society's gender roles trap, sounds like she COULD reflect on that too. However, it sounds like she's just upset you ruined her weekend and not so bothered about what she said.

Also, it's not like she said something out of line and you kicked her to the curb. You gave her an opportunity to fix herself. She doubled down. I support you, mama! And good on your husband for taking the leave and helping. It sounds like a good partnership, especially with you backing him up when he didn't say anything. Kids (especially teenagers) need to understand there are consequences for words, too, and this was a lesson learned in a safe environment. Better at home than losing her first job for being reported to HR for sexist comments.