If it is a kitsune the three times could refer both to the number of requests it fulfilled/the amount of times the kitsune will take her form for its own amusement.
Since folklore about kitsune say they require that the kitsune place a leaf on its head, and it the manga on the last page we see the kitsune dropping leafs on our reluctant lady.
@exxp for the most part it showed that she been able to understand the language of the majority of spirts that she came across, with only the most beastly being
Three times? Three times what!?? Three times suffering in river of boiling blood in hell??
Dude, taking wefies with eldritch abominations as backgrounds is THE hype nowadays.