You can massage her crop and help some of it drain and then put the crop bra on, but is the bra tighter as it is made to be that way so it helps hold he crop closer to the body to help it drain easier.
I'm trying Acidified Copper Sulfate as a water supplement for treatment. Read about it in
The Chicken Health Handbook, 2nd Edition: A Complete Guide to Maximizing Flock Health and Dealing with Disease, Edition 2.
Thank you both for your suggestions. I've had her in a supportive harness for the past two days. Her crop fully drained yesterday after a 24 hour food fast and a 12 hour water fast. Since then I've kept her in the harness and she's on a diet of plain yogurt (for the probiotics) and acv water. Hopefully she'll be feeling better soon.