you would have to weigh her to find out if she has lost any fluid.
if you followed
Axolotl Fridging Guide then it states that she can be fridged for as long as it takes for her to be getting better.
try offering her food if she will take it, don't worry if she doesn't fridging slows down the metabolism which will make her less hungry.
you should be able to get her weight quite easily by putting a tub of fresh clean dechlorinated water on some weighing scales then zeroing it, place her in the tub then weigh her, do this when you do a water change to monitor her.
you would have to research further concerning green stools, the only information I've found is that it is normal whilst fridging as it is bile being produced from the liver which shows that the liver is still functioning which is good.
I would be tempted to leave the tub out letting the water get warmer and see if she can be encouraged to eat, then monitor her for a week to see if she is loosing fluid or just weight lose due to food.