Reoccurring brainwashing

I was never a jw, I studied but decided it was not for me. My ex wife was raised a jw but when she met me she was outside the org, after having our first child (now 15) she went back in. She raise my child as a JW, we divorced when she was 5 and when she was 9 she remarried (also a jw) and moved out of state. That marriage lasted about 2 years and through it my daughter was mentally abused by both of them and the step father monitored my calls and was a general pain in the ass. My daughter was baptized at 13, then when high school hit she was disinterested and wanted friends outside the borg, this didn’t go well with her mom to the point she put her on a plane to move with me. She’s been with me for about 9 months and I’m working on making the custody permanent, she’s enrolled in school here, grades are great and she has friends. Well during winter break she was visiting her mom and something happened, her attitude went to crap. She locks her self in her room and the only person she really confides in is my sister, she’s been texting her saying her mom changed and isn’t crazy any more but I think something else happened. What’s the likely hood that elders their talked to her and put the guilt trip on full throttle. She said she went to meetings while she was there but won’t talk about anything else. Any advice on how to deal with this, her Mom used to be a pioneer so she is well versed in the doctrine and sticking to the talking points.