I would hold off vomiting her - it can be a dangerous process that ends with a dead bird if the crop contents end up down her windpipe.
I've done it successfully but before you jump right to that... check on her first, first, first thing in the morning, before she's had a chance to eat or drink anything. If you can put her in a crate overnight without causing her undue stress to make sure you get to her before she's out and about, putting NO FOOD and NO WATER in the crate overnight, that's ideal.
Overnight she should have emptied everything she's eaten and had to drink that day, so it should be a much different size and shape and be empty.
If she doesn't empty with no food/water available overnight, then do some more investigating of her crop in the morning. Does it feel hard, like there's a big wad of something? Or is it soft and squishy?
If it's hard, nothing good will come of trying to vomit her because it is likely a tangled mess of long stranded stuff all woven together. If it's soft and squishy but very full, there are other things to try first. Here's an excellent guide - it all starts with the overnight test, no matter what!
https://www.backyardchickens.com/ar...d-sour-crops-prevention-and-treatments.67194/