<human>: Can you provide a brief rundown of the text in within 3 sentences?

So my little sister left a week ago to another province (we live in Canada), told us she was taking a short winter trip to see her friends. Turns out she lied and was actually going to get married to a much older boyfriend nobody knew she had. She claims to have been dating him for two years. She told me this AFTER getting married to him. She submitted papers to legally change her last name and everything. I am so confused. She lived with our parents up until she left and never hinted at doing anything like this. I saw her pretty much every other day and now she says she's not coming back.

I want to fucking kill the guy who did this. I keep on almost booking tickets to the city they are in but I don't know what I could do. She has called the non emergency line in our city and let the police know that she is okay so we can't say she's a missing person or anything. She was supposed to just be gone three days but she told me and my parents that she is planning on living there with her new husband for the foreseeable future. She says she is okay, that rent is cheaper there and their living conditions are very good, she wants to live the life of a housewife for a little while, then enrol in university. She wants to have a baby while she's most fertile (?!?!?!). I asked if she was already pregnant and she said no but she is trying (?!?!?!?!?!). She has already completed a year and a half of university so I'm very surprised by her dropping out like this.

I have no idea where to start or what the fuck to do. She has a history of mental illness (panic disorder and bipolar 2 disorder) so I am extremely concerned for her but because she's technically an adult I don't know what my options are. I don't want her under some loser's thumb.

Thanks Reddit.
<bot>: mentally ill 19 year old sister uprooted her life and married a 42 year old man in a nearby province, trying to get pregnant