glad to hear that there has been some change.
to try and give her a chance to survive, use enough bicarbonate of soda to bring the ph up to 7.4-7.6 (if the ph straight from the tap is low) in any water that your axolotl will be in.
increase the salt level to 2g/l.
whilst she is being tubbed if possible use bottled mineral water.
try and get the ingredients to make 100% holtfreters + 0.2g/l magnesium sulphate, info here...
Axolotls - Requirements & Water Conditions in Captivity.
holtfreters will correct the water chemistry and aid in healing although not as strong as amphibians ringers solution it will be less stressful
for her to have gone so pale means she is suffering anaemia (correcting water chemistry will help).
make sure her diet is balanced and varied (when she will eat)
need to find if the cause is external, has anything been added to the tank recently, has any medications been used recently, has anything changed ie.. dechlorinater etc.. has there been any cleaning of the tank or filter recently.
have you noticed any cuts/bleeding, has there been a sudden change in her size.
DO NOT USE METHYLENE BLUE may make condition worse.
ensure that the water is oxygenated.