Your breeder's technique does not sound appropriate. That sounds like a sure fire way to cause the hen to aspirate crop gunk. If she has a large matt of grass, hay or leaves- it needs to be surgically removed, olive oil does not usually work. If she has a true sour crop (usually yeast overgrowth)- she needs something that will kill yeast- OTC stuff that can sometimes help is ACV or wine & vets usually use nystatin. If she is so weak that she looks like she is dying- this has probably been going on for weeks. Birds with impacted crops do best when it is addressed aggressively as soon as it is noticed (ie surgically remove the matt), but what generally happens is they get given massages and oils- and they get dehydrated and lose weight until they pass away. If she is still alive, I would take her to a vet and see what they think, or at least to a different chicken friend with more experience than your breeder (if she really forced in a bunch of water and squeezed it back out... if she flushed this in and out with a feeding tube- I retract my comment).
So sorry you lost your bird. You did the best you could for her.
