Excluded by partner's daughter

I want to thank you @mariac, for your very kind words. Deeply touched.
Having personal experience of 'parents constantly rowing' in your childhood has probably impacted on you a good deal, may help explain your desire to keep things 'un-hostile' around you and in your own private space. That is a need that needs to be respected.
Having done her best to fall out with you, now having fallen out with her mum and getting pregnant at such a difficult stage in her life all suggest to me that which you called, I think, 'looking for attention'. What it suggests to me is a very deep, potentially quite profound unhappiness, full of potential danger in terms of poor self esteem and problems with relationships. I hope this new phase of her life will enable you to help her and, in the process. help yourself.
Warmest best wishes to you, always,
Richard