i'm sad to read your post and horrified to learn how Dee had been treated before you got her.
my dog went missing twice - first time for a week and the second time she was gone for 9 weeks - so i can understand how you feel.

don't give up hope, Dee is waiting for you or perhaps she'd find her own way home soon. have you put up posters or distributed flyers with her pic? was Dee wearing a collar with bell? so that even if she can't mew, the bell might alert you.

i hope and pray you two are reunited soon.