my cousins relationship

Lavender

I love my cousin very much. She's 19 turning 20 later this year and her boyfriend is 18 turning 19 (my age). To give a bit of context my cousin isn't exactly stable, she has multiple mental illnesses such as eating disorders, depression, adhd and anxiety. She also has physical health issues relating to her heart. She also goes against her parents quite often, most recently getting engaged and legally wed to her boyfriend, despite them only being together for just over a year. A week ago my mother and I went over to my aunts and ended up receiving news that my cousin is pregnant. I love her very much, and she seems very excited about this baby (as am I, I've always loved kids), but I know deep down it's not a great idea. She talked multiple times about showing up to her boyfriends sports games with her baby bump, wearing rose coloured glasses thinking it's all going to be okay. Her boyfriend was apparently excited but I know that they most likely will break up during the pregnancy. Not only that but I don't believe my cousin is actually stable enough to be a mother, mentally or physically. I don't know how to talk to her about this realistically without ruining our relationship or hers with her boyfriend and parents. Any advice uterus havers?