Hi Maralv,
I'm so sorry to hear of your hurt and worry over your granddaughter. That is so difficult to go through. I don't think it will be possible for you not to care about her, no matter what she does, but you can learn to detach with love and feel better.
Members here understand what you are going through, and there are lots of tools on the site that can help make the relationship better.
Where is your granddaughter living right now? Is she safe?
Do you have a good support system around you—friends and other family whom you can lean on and talk to?
Keep writing. We are here to listen and support you.
heartandwhole