Hi Gizzy,
I wanted to join
david and welcome you to the BPD Family
Like you my SO discovered BPD after 17 years of marriage and 1 year into his separation from his uBPDxw. It sounds like your daughter's behaviors could be a result of parental alienation tactics. Her dad like my SO's ex feelings = facts and because they believe their feeling is fact they can be very convincing when telling their story/reality. It also sounds like he is projecting his own behaviors on to you.
My SO experienced a similar situation, his daughters did searches of his apartment and reported back to their mother (including what was in the fridge ), they read his text messages and reported them back, the older daughter asked to borrow his laptop for school work and then tired not to return it (we think mom was trying to hack into it).
Another incident was when my SO had a lousy phone call with his then stbxw he hung up and threw the phone into the couch, that became throwing the phone and it shattered into a million pieces, then it became he threw the phone at his kids, then it became he wouldn't let the kids call their mom, then it became he wouldn't let his daughters leave his apartment... .all of those stories from a woman who was not even there. But her daughters went along with it and my SO had to go to court and face a charge of child abuse. Super concerned mom didn't even show up, told the judge she was sick, where was she really? Out getting a mani/pedi with their younger daughter
He brought is intact phone to court told his story and the charges were dropped. His daughters had no idea what they had started, or that it could have meant they didn't see their dad. They just believed or it was easier to go along with their uBPDmom... .even though she was not there during any of it.
Below are some links to information and book ideas around parental alienation... .
https://bpdfamily.com/message_board/index.php?topic=104479.0https://bpdfamily.com/message_board/index.php?topic=216244.0https://bpdfamily.com/message_board/index.php?topic=226013.0https://bpdfamily.com/message_board/index.php?topic=59950.0Another resource is Youtube videos by Dr Craig Childress.
Getting your kids into counseling is key! Great job getting that set up for them

it gives them a person to talk to that is outside of the conflict, someone that can help them with coping skills, and someone that can help them work through their feelings around all of this.
I know this is exhausting but you are doing good things for your girls and that is so worth it! Unfortunately, when leaving a marriage/relationship with a pwBPD (person with BPD) it can be more of a marathon than a sprint. Try to take care of you too, do something fun, hang out with friends once in awhile, escape into a good book or movie (Go see Wonder Woman and get your Girl Power on!

), get some exercise (get those endorphins going and energy up!) or whatever it is that helps you relax.
Most importantly know you are not alone! You have us!

The members here are great for support, ideas, providing tools that can help, and sometimes just a listening ear when you need to vent.
Again Welcome

Panda39