It is hinted in Finding Emo that she and Jorgen are no longer a couple as Jorgen was shown dating a Fairy named Wallet.
Her gift for Timmy Turner's fairy-versary was a roll full of floss.
In "Shiny Teeth", she has to poof back and forth every time someone puts a tooth under their pillow, but in "Wishology!", she uses a machine called the Quarter Transporter. This was probably done so she doesn't waste so much time in poofing back and forth.
In "Fairy Idol", the Tooth Fairy is not a good singer, but a dolphin liked her voice.
She may be an Ancient Fairy Warrior because she is a tall fairy like them, and shares other similarities with them.