Celestia...what the hay?

Princess Celestia is supposed to be a protector and ruler...

But why on earth does she seem so shady?

Twilight Sparkle has been doing the dirty work for quite a while now. So why does Celestia do nothing all the time? If we all remember in the first EG her main concern is for Sunset Shimmer. She is cold to Twilight the entire time.
Also one thing of her story doesn't make since...the Mane Six turned Luna back with the elements of harmony, why couldn't Celestia? It just doesn't add up.

This is just some thoughts that I've been wondering about for awhile. Sorry if it's short.
~Winter