I had the scariest dream that the devil told me i was going to die?

There is this girl named liz who is an acquaintance of mine( she is my cousins friend, i see her at parties say hi etc..) now in the dream she tells me that she is the devil. I'm like yeah, right -_- sure you are..so i ask her to prove it to me. She does a series of little things that are just one step above magic tricks that you can buy at your local joke shop. I didn't believe her at first so i kept asking her to do things that would work out in my favor, i dont remember what but it was something small like get me a taco sort of thing. She was trying really hard to prove to me that she was the devil for some reason, i remember she made her voice sound really deep and demonic and then i remember that she sat down on this fish tank and broke the gl then i said sarcastically, "You broke my fish tank!! Since your the devil why dont you fix it??" she did. with one swoop of the palm of her hand and i saw it right before my eyes. Well, that freaked me out. She was talking to someone else when i came up to her and asked "hey so your the devil, when am i going to die?" she said "soon..on September 3rd" i was freaked out i remember having a lump in my throat when i asked her because i wasn't sure if i wanted to know at all. Then i remember being in a little room and i felt like there were demons all around me. My phone kept ringing and some of the people that were calling i didn't even know and when i answered no one would say anything. I remember feeling really guilty as if i have betrayed god when i didn't even do anything with the devil. I did ask some minor favors of her which i felt guilty about but i tried to justify it by saying i was just trying to see if she was who she said she was. This dream was really weird and kinda frightened me..what does it mean? Thank you