@ladyearth
There is obviously some fluids getting through if she is pooping liquid, so that is a positive, but she can only survive so long on fluids alone. She needs to be kept somewhere warm because she is not getting enough nutrition through her system to keep herself warm and she will be burning off her body reserves at the moment to maintain body temperature and survive.
If her crop is so full of fluid that it is refluxing when you handle her, then you need to empty some of that out before you massage her. You will need to do this by holding her so that her head is lower than her body and tipped slightly to the right and massage from what would be the lower part of her crop if she was upright, forwards so that all the debris that is settled and clogged up in the bottom of her crop starts to get broken up and some of the gunge comes up. It is risky, but she is going to die if you don't manage to unblock things and if she is refluxing fluids when you pick her up or massage her normally, then you have nothing to lose. Watch some You Tube videos that show you how to do it. You may have to work at it for half an hour or so, giving her little breaks in between, just to get a little bit up and you may have to do it several days in a row or even twice a day to get things broken up enough. After you have been successful at getting her to vomit some up, then allow her to drink a little electrolyte solution and massage in the normal upright position.
She will not poop solid poop until you get that crop working properly and she can start to eat food, so don't worry about the liquid poop. You cannot expect anything else.
Once you get some of the gunky fluids out of it, so that you can massage it properly, feel for a putty type mass near the bottom, as that is what will be clogging things up and palpitate that to try to break it up.
There is no point in giving her grit at this stage as the crop is not thick/strong enough to grind up that debris and grit is not going to be able to pass into her gizzard through that debris if food can't, so grit will only me things worse.
At this stage, my feeling is that there are only two things that might work..... surgically removing that debris from her crop by cutting into it through her skin and physically pulling it out..... or trying to break it down by intensive massage. I can talk you through the process of surgically removing it but it is not for the faint hearted. If a vet is not an option and you don't feel like you can do the surgery yourselves, then you need to be very committed to vomiting and massaging to try to clear her and just giving her liquid feed... ie electrolytes, whilst you do so. Anything else will just get clogged up in the current blockage and ferment or rot, making it worse. You have nothing to lose at this stage because she will die if you do not get things moving, so don't be timid about massaging her.
My personal opinion is that a crop bra will not resolve this problem but may help her if/once you get the blockage cleared.
Good luck with her
Barbara