If there wasn't any green mold on it i wouldn't worry about it. Cheese is aged as it is. So as long as she found it in the refrigerator and not under the sofa it will be fine.
To keep it fresh
I would say sealed container as it is the air that spoils it.
If its frumunda cheese you can keep it sealed for about 5-6 months Definition of Frumunda Cheese: Cheese From unda your ballsack
1 month max.
he hardness of cheese tells you that the cheese is either becoming old or it was not sealed in its package right. Most the time when cheese gets hard it is because it was left out in the open and air dried it out.
Blocks of cheese that are shiny outside have been sealed in wax. This helps to keep some types of cheese from drying out during the aging process.
If it has been in a sealed container in brine it will be fine. I would love some of that.
-- A 2-lb cheese wrapped in heavy foil and sealed in a box. -- A rock that weighs 2.2 pounds.
Some cheeses, such as Babybel or Edam, are sealed with a wax. This should not be eaten. Also, some methods of cheesemaking form a rind on the outside of the cheese which is not especially tasty.
No food safety person would ever recommend that you consume an item that should be kept refrigerated when it has been left out for 3 days. Toss it out.
In a sealed container in the refrigerator. It will probably last about 10 days before it gets moldy and becomes a "science experiment".
I left a factory-sealed package of swiss cheese out of the refirgerator for almost 24 hours. I then put it in the refrigerator. Later that day I opened it. It felt a little greasy, smelled and tasted the same.