YAY! So glad you found it!
Good idea with the chain. Maybe you could get her something less sentimental to wear on her finger for awhile so she can still be "like mommy" and you don't have to worry if she loses it. Then, after practicing with that ring, she can get to wear her good one again. Once you're confident you won't go through this again.
Oh yeah, thanks for the link you sent me with the tots jewellery! My wife came home with a ring from People's jewellery before I could show her the link though. Maybe we'll order something else from them if they sell other stuff.