Mommy Neecey -
I'm really sorry the way things have turned out, but as we said all along, it was your aunt's decision.
As far as "coma" is concerned, yes, she will probably be aware that you are there...my mother had been in a coma for a week before she died. The last morning, I took her hand and told her it was okay to let go, and she opened her eyes, looked at me, closed her eyes, and breathed her last breath. I absolutely know that she heard me.
Please inform your relatives not to talk about her as if she wasn't in the room (go to another room to talk, if necessary). Make sure she has adequate pain medication. Also, when someone gets close to death, their body becomes oxygen deprived, and they may exhibit restless movements, trying to toss and turn, moving their legs, asking you to move them in the bed, etc. Morphine will also help this. Once she gets to that point, she should be put on a morphine drip, not shots, as the shots wear off and then it takes too long for the next shot to take effect.
This is going to be a hard time for you, no doubt about it. Watching someone you love die is probably the worse thing on earth...but, being there is the last thing you can do for that person, and will be very meaningful to you in the long run.
I wish you continued strength in the days ahead, and offer my support (through the boards) whenever you need it.