Personally, I think it's all about the wand. Now does Tinkerbell have a Wand of Wonder with random effects ? Perhaps a wand that acts as a focus and allows her to cast spells without materials?
I will immediately report any Phishers or Lonely Hearts Scam Artists.
Something to remember is that the spells from a tiny caster are just as effective as the spells from a medium caster. Does your dm follow rules about the size of spell components? I usually allow components to be sized for the user with no change in price.