I didn't know Kotohime was her name, and so I translated it as "wakimi koto hime", also not knowing the wakimi is Reimu's nickname translated into English as Armpit Miko. Thanks for fixing it.
Bunny-ear HaruhiArmpit MiKotohime
it makes a portmanteau of "wakimiko" (miko who shows her armpits, in other words Reimu) and "Kotohime" (the girl's name, presumably)