Help diagnosing and treating a lethargic d'uccle pullet. Video link included.

Breed: D'Uccle
Name: Guinness
Age: 8 months
Issue: I can't put my finger on it but something isn't right. I finally brought her inside today to observe and caught her doing some strange stuff on video. It is almost like she's trying to regurgitate something. Her crop is hard and tender to touch, too.
Tried: I gave her a few drops of olive oil and plenty of water. Planned on massaging her crop in the morning and repeating the olive oil- though she doesn't like it.

Video: http://s74.beta.photobucket.com/user/Mustafear/media/Chickens/IMG_2751.mp4.html

Help?