O god, what do I do???? I really need help, this is bad.?

My cousin who I was very very close to until the past few years, got arrested on felony drug charges while on probation last week, released on bail, and then called my aunt (her mom) to inform her she is going on the run because there is a very real possibility of her facing 5-10 years. My aunt is very secretive about family issues, and I didn't know my cousin was in trouble until a few minutes ago. Apparently, about a year ago she got arrested, and was facing grand larceny charges along with minor drug charges. She got lucky and the big charge got dropped, and she was put on probation for the drug charges instead. With this recent arrest, her grand larceny charge was brought back up, so she is in very serious trouble right now. Now that's bad and all, but the reason my aunt told me about all this is making me rip my hair out. My cousin called her from a different state today to inform her she is trying to make it out here to MY HOUSE to lay low for a while. My aunt was so ashamed to tell me about all this, but she wanted to give me a heads up on the situation. So now she is trying to cross multiple state lines. And on top of this fact, my fiance has been on probation for the past 3 years for getting arrested 2 times in a row. He is less than 3 months from being off probation early for good behavior. Those arrests and his brief time in prison were a major wake up call to the both of us. Right after his second arrest, which was much more serious charges than the first, I stopped taking with my cousin entirely. I just couldn't risk getting caught up in her crap and loosing the man I love, so I got clean with him and grew up. She went off and apparently went nuts. Now she is a fugitive on her way to my house. Yes she is the girl I used to play with as a child, but then again, this is my life and my almost husband she could f-up. Letting her stay would not only mean putting myself at risk for harboring a fugitive, but if my fiance got caught up in this mess, it would mean SERIOUS trouble for him, possibly even reinstating his charges. If my cousin makes it here, she is not the type I can quietly turn away. And she could possibly still be on crack, which makes her even more out of control. I am not risking everything good in my life to let my dumba** cousin stay here. But I am afraid of what will happen if I turn her away. She could get violent or cause a big enough scene for the neighbors to call the cops and then I'd be up a creek for not reporting it. And I could never tell the police on her, even if I can't let her stay with me, I can't screw my flesh and blood over like that. What the hell do I do?