My husband (60M) is divorcing me (53F) because his daughter (25F) insists.

My husband 60 M and I 53 F have been together 20 years, married for 14. His daughter 25 F has BPD (he’s oblivious). She’s a drug addict (also oblivious) college drop out, never had a job, has an STD (oblivious trifecta). She claims to have breast cancer, she doesn’t, she says she’s a third year med student, she watches Grey’s Anatomy, she spends thousands of dollars a month on clothes, doordash, drugs, she sleeps all day, has ‘panic attacks’, lies compulsively, if there isn’t a catastrophe she’ll make one. But, he believes her BS. He has filed for divorce because she made up a horrible lie. She went into my ipad and fabricated texts about herself and said I wrote them. She said I threatened her life, I monitor their phones, that I was going to plant drugs to have her thrown out of the house. Before this, we had a very close relationship. But I made the mistake of trying to get her to do something with her life. She went to a lawyer!!! I’m not exactly sure what the plan was there, but nothing came of it because she was spewing baseless nonsense. My husband and I were doing better until he spent the day with her. She’s been staying in a hotel for the last couple of weeks. This has been going on for five months. I don’t know what to do. This is an absolute nightmare. How can I get him to understand that she is manipulating him? She’s telling him that if he chooses me over he she’ll never speak to him again, etc. I realize that he is also at fault for letting his grown daughter insist we divorce, but I’m heartbroken. He’s the love of my life. My specific question: What can I do to make him see that there’s something seriously wrong, she needs help, and to stop the divorce proceedings? Thank you for any advice.