I agree, hydration first.
I also agree, plain water and some poultry vitamins (direct dose).
If it's hot and she's not wanting to drink the garlic water - give her plain water - see if she will drink that on her own. Most birds I have every had with a crop issue will usually drink plenty on their own unless they don't like the "taste" of it.
Once you have her drinking, read the article below for helpful information.
You DO NOT want to give a Laxative.
Stool softener (which is not a laxative) can be given IF the crop is hard and boggy and not moving AFTER you have tried to resolve the crop problem with fluids, coconut oil and a little time.
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/