Divorce Poison by Richard Warshak -- excellent book about parental alienation. Highly recommended.
I always recommend Power of Validation too, which is the key to helping your kids know what their truth is. A lot of kids with BPD parents hear lies for so long, including doubting how they feel about things, that reality is easily warped. Your daughter may have fleas

--what people here refer to as learned behaviors that we pick up when we're around BPD for long periods of time.
About your younger daughter -- you need to document that your is not complying with the order. And then file a motion for contempt. Start documenting what's happening, and be prepared to file a bunch of these motions. It's pretty common for pwBPD to not comply with the very thing they agreed to. Motions for contempt are kinda like parking tickets in family court -- in other courts, a person might go to jail for not complying. In family court, it seems like you have to be in contempt many times before the court sees there is a pattern.
Document everything -- try to get her non-compliance in an email. So if she does not bring your daughter at the arranged time, email her in very concise, professional, business-like terms. "It is 10:30am on Saturday. Per our order, you were to bring D to my house at 10am. When do you plan to bring her?"
Create a paper trail that you can share with your L. Even if your ex does not respond, that's a response.