OP, you ask ‘If you were in the same situation again what would you say to her when she first told you she was pregnant?’
‘DD, when baby is born, you will be 18yo with the responsibilities of an adult.
Therefore I will treat you as that adult now so that you understand how your life is going to be with a young child. We speak as adults, so I am Penguin to you, not Mummy.
I have brought you up to take responsibility for your actions & decisions to prepare you for your adult life. You will always be my daughter, my adult daughter.
I am looking forward to having my life as I want it to be. I have made plans for myself & having responsibility for another baby/young child is not on the cards.
I do not want to have a baby/young child living here with me. It is too much responsibility & disruption for me & as their mother that is your responsibility. I will emotionally support & encourage you as a mother as best as I can.
You are to make your choices as a woman & I respect that.
I have made my choices & you as an adult are to respect that.’
If you know what you want, you have to be clear cut & resolute about this. Your actions have to be louder than words.