You have my sincere condolences, as the other's have said, the Gods take care of those important to us. Her soul will have a chance to reincarnate. I know deeply what you are going through, I understand it very well. I had the same worries initially. But just know that she will be safe. You're doing all you need to right now by trusting in the Gods.
I had to go through a similar situation and it almost made me give up because of how deeply it hurt, but remembering that our deceased loved ones aren't gone forever, they are temporarily in a safe space and we will have a chance to see them again one day when they've reincarnated, gave me hope and strength to continue.
Everything will be ok. If it also gives you comfort, this is what I try to think of when missing my loved ones instead of grieving. Instead of sorrow feel happy in your heart that by making the right choice to follow Satan, this means those we love will be helped in return as well. By following this path we bring honor to our families, the contributions we've given to this world will give our loved ones a better life someday. Adding on to what Blitz said, The best we can do for our loved ones is keep doing good work for Father Satan and the Gods so when they do reincarnate they will have the chance to be in a safer more satanic world. I've had to come to that realization as well to help me cope.
Again, you have my condolences and my love goes out to you. Stay strong. We are here for you.