That's because they would show at the beginning of Winter rather than the end.
Letty went back home all satisfied!And Lily has finally shown up!It's spring!Her opponent's dead!That was just an afterimage.See you later, Letty!Eternal Force Blizzard!There it is! Letty's Eternal Force Blizzard!Spring-Announcing Fairy and LettyAnd with this, winter has come to an end, too!