Chris, I would look into also changing that gravel to either a bare bottom or sand. Sand would be better.
Also go with Hailz and Cynthia's advise and keep her in a food safe container with a lid on it. Poke holes in the lid for air. You can also tape a piece of black construction paper over the lid and also poke holes in that. This keeps the light from scaring the Axolotl if you can't tape the light down in the fridge.
Your Axie could eat some of the gravel and that can be really harmful.
Jordan, Hailz is right. The cold water also helps the Axolotl to heal.
It seems to me she was trying to get out from her water conditions.
Chris, when you test your water, please post your readings.
Also, your tank should follow up with 25% water changes weekly. This helps the tank to stay healthy.
The water readings should be:
Ammonia 0
Nitrite 0
Nitrate 0.0 - 20
PH 7.0 - 8
Stress coat is wonderful to use as a declorinator.
Salt baths help Axolotls with illness or skin that has fungus. Either a teaspoon of salt to two litres of water, or you can do two teaspoons of salt to a litre. Both are just fine.They should be given twice a day, ten minutes each. Make sure that you don't go any longer than 10 to 15 minutes or you can "burn" your axies skin from the salt.
Your axie looks very sick. Also she looks rather thin.
What are you feeding her?
Try and fatten her up with some juicy earthworms
.
Here is a link about tank cycling:
http://axolotls.org/requirements.htm
Here is a link about safe and unsafe chemicals to use in your tank:
http://axolotls.org/health.htm#list
Anything else visit
www.axolotls.org
Please let us know how she improves.