Greetings
Jamie Molihan,
In time, your little girl may outgrow the problem with her slow moving crop. So, yes, your instincts are right...make her a crop bra to support the crop. There are many suggestions online.
You will also, have to monitor her crop every morning, by giving a little squeeze to see if it has emptied over night. Make sure to have a crop treatment ready in your "chicken medical kit", in case she ever needs it for crop impaction, or sour crop. Every keeper has there own remedy.
Here is a link to a post here on BYC, about a crop problem. You may learn what to expect during a crop crisis.
www.backyardchickens.com/threads/chicken-sick-need-help-asap.1237732/
As for the hernia, she may also outgrow this too. Until then, she shouldn't be jumping off or on, high perches. You may need to lower them. I had a hen with a hernia, due to swelling from ascite build up. She was very active, so I made her a little hen saddle with an attaching truss, that protected her belly area. I would put it on, only when she was swollen, as, she would go into remission off and on.
By all means, if little Hildegard is running around, and wants to be with her sisters, let her go. She is feeling better now that her crop contents have moved out. Just monitor her
over eating and check her crop this evening and in the morning. It should empty overnight, and she should have good poops too.
She's just going to be one of those chickens that needs a little more attention. But, it sounds like you are a caring keeper and a good chicken mama, too. So, I think she is in good hands.
If you have any questions or concerns, just let us know here on BYC. We'll try our best to help and support you.
God Bless