Good guesses, but it isn't Ripple, or Strawberry Surprise. I can try to get us another hint if this keeps getting hard, but hang in there for now.
I'll just try to help out. I see pink hair, white, a pink bit, and some green. The white and pink area look like it's just around the mane, and you can tell it's the mane from the way it's rooted in rows. Any ideas on that bit that's just around the mane? There aren't many ponies that have a different color thing around their mane, not to mention, I see a shadow around the pink thing, so what does that tell you?
Keep guessing, pony sleuths, I know you have it in you! Last year was easy peasy, and it went too quick, so I tried to make it more of a challenge this year because I know we have some good eyes out there.