Not that she didn't appreciate it, but just watching Applejack put together an entire dressing room was a prime lesson on How to Exhaust Rarity In 73 Easy Steps.
Perhaps after some rest, however, she might have a better idea how to show said appreciation. The only wildcard, then, would be Applejack's reaction...
An epilogue to DIY w/ Applejack.
Part of the Montage Cinematic Universe.