As a mom who had two children that were essentially abandoned by their father, I would agree with all of the advice above. Do NOT drop out of your daughter's life. My ex was bipolar and had serious issues that led to my leaving the marriage. I encouraged visitation but documented all of the issues as there were times things appeared unsafe/unhealthy. I was seeing a lawyer about supervised visits when he simply stopped contacting me or his kids. He last saw them for visitation when they were 6 and 4. He committed suicide when they were 19 and 17. I only provide the background info about him to explain why he did not see his kids. I never denied his visitation even when he owed me 40K in support.
My kids both had issues with trying to understand why their dad didn't want to see them. I did my best not to talk badly about him in front of them, but I did answer their questions honestly and stated that I also did not understand why he chose not to contact them or see them. I assured them it was nothing they did, but was likely related to his mental illness. I do know my daughter had some pretty sad times trying to come to terms with this. I think every child deserves both of their parents in their lives. Be there for your daughter and fight for your rights.
My kids both had issues with trying to understand why their dad didn't want to see them. I did my best not to talk badly about him in front of them, but I did answer their questions honestly and stated that I also did not understand why he chose not to contact them or see them. I assured them it was nothing they did, but was likely related to his mental illness. I do know my daughter had some pretty sad times trying to come to terms with this. I think every child deserves both of their parents in their lives. Be there for your daughter and fight for your rights.