personally, I think she is and this video explains.

P.S. I do not dislike any of these episodes in this video. Also I do not hate season 4, it is actually by far my favorite season of the show,but Pinkie Pie to me so far is a problem.

Also, never heard of TheMysteriousMrEnter, well here check out his channel, I recommend him as a great reviewer. 

TheMysteriousMrEnter's channel: http://www.youtube.com/user/TheMysteriousMrEnter

TheMysteriousMrEnter's Pinkie Apple Pie review: http://www.youtube.com/watch?v=uTd7yq8sjdY

- I do not own My Little Pony: Friendship is Magic. All credit goes to Hasbro and The Hub.