It's Mia as she first appeared in Aake's comic... (http://furaffinity.net/user/aake)
regarding her current iteration. Me, I really liked her previous look. But hey, look, Aake kept her hair, eyes, even her ears close to what they looked like at first. =)
Link
Aake
It's about consistency. She kept wobbling between a pixie cut and the current one during her 152 appearances in the original.
Much like how the original began with a doodle of Mia, the revision also did.