Hard to know if she will need a bra all of her life. The crop is somewhat elastic. The sooner you can correct the crop problem, the better the chances it will go back to normal.
If her crop is still not emptying by morning, I would continue to address the symptoms.
Sometimes when it's pendulous the crop needs to be lifted with a bra in order to get it to drain properly. While coconut oil can be very helpful if the crop is hanging low the contents are not able to empty...
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It looks like her crop is pendulous, she may need a bra to help you get it to empty. See the article below for treatment.
https://www.backyardchickens.com/articles/how-to-treat-sour-crop-and-impacted-crop-and-how-to-know-which-one-youre-dealing-with.73607/