How is she this morning? You need to get that gunk moving or it is going to poison her.
Have you wormed them yet? The crop is not going to empty properly and will back up if the bird has an intestinal blockage of worms. So you need to do this today.
Then treat this as an impaction. You might try this conconction on her to help dissolve this mass. This comes from my article about crops....
1/2 teaspoon Baking Soda (do NOT use baking powder)
1/2 teaspoon Ginger Powder (you can even use the contents of a human Ginger capsule)
1/2 teaspoon Cinnamon Powder
1/2 teaspoon Chili Powder
a squirt of Lemon Juice
2 Tablespoons of water
Mix this all together and use a syringe without a needle and suck up 1/4 to 1/2 ml at a time and squirt down the throat, in front under the tongue. Never give more than 1/2 ml at a time or you can aspirate the bird, having it go down the wrong pipe. Get this ENTIRE mixture down the throat. This will only take a few minutes to get it all down. Do this 3 times a day for one or two days and the mass will dissolve within 24 to 36 hours. If you know how to tube feed, you can give this one one fell swoop through a tube 3 times a day.
Get her wormed today if you can. This is not going to go away by itself and will kill her if action is not taken soon. She has been sick far too long and like old food, it turns toxic in the system.
Keep us posted!