You know, I lost my ferret almost the same way only she climbed up a wooden board I'd put in the patio door then scratched the flywire to make a small hole and went missing for a week.
I'm glad to say I got her back (she was in a garage about 2 streets away) and she was fine when we collected her.
It's good that you got your ferret back too and I'm glad she recovered from being bitten.
