Why didn't my Firoke evolve?

[ISNorden]

So I'm training up all my low-level 'mon to add their evolved forms to my Dex total.  I've defeated the old Seikamater, collected the Royal Jelly, and (thanks to rematch-grinding) trained a female Firoke to level 44.  She's holding the Royal Jelly, I feed her a Rare Candy to reach level 45 -- no evolution.  If you'll excuse the pun, is this a bug?  What did I do wrong otherwise?