Twilight hadn't had the chance or the reason to go after a Chocobo, really. As a natural pony, doing so would be counterproductive. Even if Shining Armor would get a big kick out of doing so.

Either way, seeing Estellise have problems prompted the fellow princess to come to her aid.

"Not all Chocobos are that bad." Twilight responded. "From what I understand, the Chocobo Farm owner has a special lure that can bring a friendly one over. Of course, there are many who want to catch one bare-handed."