Pipp was hyped up in the promo material and then turned out to be a completely extraneous character to the plot and to have an annoying personality on top of it.

She brings the group the crystal that they dropped and only tags along because she’d rather not be captured by an angry mob. Her claim to fame was being able to “fly”. Restoring the magic to Equestria would let every pegasus fly and make her “ability” not special in the slightest. Sunny, Izzy, and Zipp all have a solid reason for travelling together. Pipp and Hitch are just sort of there.