Ive asked this a lot of times but what should i do with my bfs lil sis she got pregnant with my ex boyfriend?

im realy worried abut her she is only 13 just like i was when i had my twins i feel realy bad about it i think that she might be fallowing me & herolder bros foot steps btw i named my daughter after her if that means any thing please answer it will be greatly appreshated no mean or nasty comments