I think that she isn't playing Deibu, she just trying to use the old and mistaken assumption of yukkuris that "their cuteness and easiness will stop others from attacking them and even follow their commands".
But we know that is never effective, EVEN between yukkuris.
We may not be able to know the intentions behind this, but we know what she's actually trying to do, reason why I said the whole "trying to use their so called "cuteness and easiness" to bend mister humans their way."
If it's for Marisa or to save herself, It's up for each one's interpretation or word of god, I believe she is doing it for Marisa, but, that doesn't mean she isn't being a dumbass by picking up the most stupid way to "negotiate" with a human. one thing for sure, just because she's trying to save her husband that doesn't mean she isn't scum, scum can be loyal to their families, while being a shit to everything else yukkuri or not.