rumplestiltskin, It is great that you are seeking help for your daughter as you sound like a very caring mom. Like any death, this miscarriage is the same. I believe that your daughter will need to go through the stages of grief and sometimes we get stuck in a stage and it will just take time. Below is an article on this.

The 5 Stages of Loss and Grief | Psych Central

I wish her the best and just keep being a great mom.