Do you have regular access / scheduled contact with your daughter?
Have you been able to maintain any kind of a relationship with your daughter?
If not, why not?
Do your in laws withhold access to your daughter?
If you don’t have access or any kind of visitation with your child, this is the very first thing you need to remedy. If you need to go to court to do this, you can do this either alone (self represent) or with the help of a solicitor. You can contact and ask for support, enquire about parenting courses you can go on, whether you think you need this or not, do it anyway…it shows both willing and effort to the courts to improve yourself, your parenting skills and your situation. Do absolutely all you can to make your home environment a stable happy and healthy one as court will absolutely be taking into consideration your current circumstances.
If you don’t have any way to communicate currently with your child, create and email account that you can send emails to in which you can write to your daughter to tell her that you are thinking of her, how you hope she’s doing, commemorate special dates an events in her life and share what’s happening in yours, how you are fighting for her, how much you love and miss her etc. This is for you, somewhere for you to be able to talk to your daughter, and maybe, just maybe whenever she is old enough to understand and has questions about you and what you did for her you can give her the log in details and she can access the account herself and see all the emails you sent, how often you thought of her, wished her merry Christmas or happy birthday etc you get the idea and it will all be dated and time stamped and is a record for all the times you longed for her, cared for her, missed her, loved her.
I understand why you Dad is such a key part of all this for you (especially if he really is a narcissist) but honestly this is a red herring and not a useful or productive way to spend your energy. I understand that you feel he played a big part in the events of your life leading you to the path you must walk now, but directing your emotion towards his part in all this won’t change the situation for you or your daughter. Narcissist parent/child relationships come with a lot of trauma which I’m sure you’ve experienced and is also what clouds your judgement even now, that fog and toxicity is hard to let go of, even when you really really want to. For this I urge you to seek counselling to help you heal from the trauma you no doubt carry.
I absolutely understand how you must feel so incredibly let down by your parents and father in particular. How you ex and child’s father didn’t support you through PND and when you needed him most. How you must feel that your in laws used all of your hurt and trauma to rob you of your child. This is a lot of pain and hurt for any one person to carry, and I sympathise wholeheartedly. But if the goal is to re-establish contact with your child, or to gain custody going forward, you need to deal with the trauma that has plagued your life, so that can do what you need to do to fight for yourself and your child 💐