Leslie,
The one point I really, really want to stress is to please be patient with the introductions this time around. While I think you gave up too soon on Fawnie, I want you to be a multi cat household, so, I urge you to try again. BUT please follow the advice...and be slow and patient. The saying, "don't keep doing the same thing, and expect different results" (or how ever it goes), seems appropos here. I have introduced mature cats, kittens, dogs, many times. I really think the key is slow and steady.