Helva as a ship

so when reading about helva as a ship i was very surprised that she didn't take the envelope and become a functional being, although who is to say that she wasn't already seeing as how she is functional as a ship.  I for one can't imagibne what that must've been like for her but i couldn't help but wonder if she did take the envelope what would happen to her debt, also would she have a new debt to the corveikey?  we already know she would have had to stay so that is kind of a debt.  I figured since she already traded into one machione, why not another, but she shows being content by not doing this.  Perhaps a driving reason was her responsibility to the ships passenger, perhaps she got a feeling of self fulfillment out of  providing a service, of being the one who is smart enough to command this ship and being needed.  I also think it could've been done out of a motherly nature to try and protect and return the passenegrs who had chosen not to stay.  On a side note in terms of the envelope i imagined something like what the little alien guy was inside of in men in black.