I feel like she has to get a re-release
eventually. Hasbro loves to re-release their mane six, Rarity and Pinkie have both received re-releases; Twilight has had several.
AJ was off the shelves before G4's big boom. She would sell twice as well as she did the first time round since so many people are after her now. All Hasbro has to do is take a look at her eBay prices.
That should tell them that they'd make big bucks if they re-released her.