I'm so sorry to hear that Fatty has gone missing and that Pretty Girl is on her own. She must be so lost without her guy. But I'm so glad to read that she might be going to Donna's house! It will be so wonderful if she could have a permanent home full of warmth and love. Please keep us posted!
Prayers that she will figure out the whole litter box thing so she can go to her future home.
p.s. will you post an update if Fatty ever shows back up? Maybe a home can be found for him at that time.