I would think to incubate would give you more of a piece of mind, than worrying about relying on your broody lady.
Take the stress off yourself, you have been through enough I say, incubate
I hope your lil egg is fertile and hatches out a little fuzzy butt that will fill the void in your heart :(So sorry for the loss of Rosie.
I hope the dog is caught and contained so this does not happen again ???