Swap their blankets with each cat and allow them to get used to each others smells and take it from their Is Misty an older or younger cat? She could be a GOC-grumpy old cat set in her ways, plus whatever her story is may have something to do with it, but i'm sure with all the love,care and patience your giving and showing her she'll come around in time and they'll soon be the best of pals or at least learn to happily tolerate each other