Illrose was running around with Cadaver when they found a Cadaver-look-alike. Illrose thought it was hilarious. xD
And when Celeste showed up with a look-alike, it was even more hilarious. xD
"I don't stand out from this group, do I? No? Good."
I have realized that Illrose laughs a lot, she used to be such an serious character as a dragon/ human. I think the Forest has loosened her up a bit. :')