Melissa I am sorry for your loss but please don't blame yourself.
There is often a sense of guilt whenever we lose a loved one. I buried my sister two days ago and one of the greatest emotions I felt was guilt for not spending more time with her.The unspoken words that will never be said and the empty space that can never be filled....
From what I have read you did nothing wrong. Grieve your mother but celebrate the wonderful miracle of your daughter and know that in a way your mother lives on. Death merely cracks the mold that allows our spirit to finally be free...