No, Toni, you didn't kill her. You told her it is ok to go and she felt comforted that it is her time to go. You have been a good daughter to your mother and be glad of her peace and you will make peace with her as she is in better place.
Give yourself some time to grieve, cry and remember the way she was. Be blessed for that!
I am so sorry. I lost my mother in March. It was a relief when she died because of ongoing health issues, but now that she is gone there is a sense of overwhelming loss. I am not sorry my mother died but I am sorry she is gone and I imagine you feel the same way. There are worse things than dying. A friend of mine who is an American Indian once told me that "sooner or later we must all wear the wooden blanket". For some odd reason I find that comforting.
My condolences to you and your family. Take a deep breath and stay strong. You most definitely did not kill your Mother. You knew and she knew it was time and she felt your Love just Before she passed on. She is so much better now and Not in any more pain. You will see her again. Just know she is still with you in your heart and memories. There will be signs of her still being there for you. I know the year my late husband died on my birthday I came home from work and there was a candle burning on the coffee table. No one had lit it.
You a very good daughter for staying with and taking care of your mother when she needed it the most. You can remember the good times and maybe you will recall some of the not so good times, just know that your mother Loved you with all her heart and soul.