I think it's pretty clear she was the cause of the egg hatching. I don't know what part of that looks like a dragon, though.
Trying to stab her in her sleep is like trying to stab Superman in the shape of a female elf. That she has a non-glamorous day job as a guild receptionist and then comes out to secretly fight in emergencies after taking something off doesn't help the similarity.
But I'm gonna be honest, the art really isn't doing it for me. It doesn't help that the writing doesn't seem to be better either.