At first, I didn't much care about her since she was more of a glamor-lover than anything else. Then when series progressed, so did she. And soon she became that semi-eccentric pony who said “YES!” or “I LOVE IT!” and “MIIINE!”
Best. Character Development. Ever! :D
And I'm starting to think that she almost has similar traits to Pinkie Pie, but with more self control apparently.