My girlfriend just admitted to me that she's an illegal immigrant; what should I do?

I live in southern California and am currently dating a girl from El Salvador. Unfortunately, it turns out she's here illegally! I am against illegal immigration and suppose I should turn her in, but I've fallen in love with her, she's so hot you wouldn't believe it and she's very nice too! Not only that, if I get her deported, I'll have the Mara Salvatrucha coming to my doorstep to kill me! Seeing that she's from El Salvador I'm certain she probably knows at least one person in the MS-13, so what can I do? Should I just marry her and forget she was ever an illegal immigrant, or should I get her deported then put layers of barbed wire and automatic machine guns around my place of residence?