I think you still have a very strong maternal instinct, and that is aroused by handling a baby with whom you have a biological link.
I think your daughter is being insenstiive, but given that she is taking the somewhat unfeeling stance on the issue, I would pull right back from discussing your feelings with her any more. If you need to cry when the little one goes home, make sure you don;t do it until your daughter has gone - it will only exacerbate the situation.
I would not be inclined to think of child minding or adoption, because neither option is going to resolve your feelings.
I think you need to allow your feelings, and discuss them with friends of a similar age, who are more likely to understand and support you.
I think your daughter is very lucky to have such a caring and loving mother, it's a shame she doesn;t appreciate you.
Try not to let your feelings stop you from enjoying your grand-daughter's company. The relationship between Nana and grandchuldren is very special - my wife adores being a nana to our two grandchildren, all the fun and plasure, none of the problems or sleepless nights.
Enjoy your new role fully, and your distress will fade with time.