Answer:
her yeast was expired
Step-by-step explanation:
Yeast is an agent capable of producing fermentation. Yeast is the best known natural yeast. It is a fungus like mold and mushroom. There are over 850 types of yeast, with Saccharomyces cerevisiae being the most widely used in the manufacture of fuel alcohol (ethanol), alcoholic beverages (cachaça, beer and wine) and bread.
Fresh biological yeast is the one that comes in a tablet and it is very easy to know if it is good: just knead it. If it crumbles, you can use it quietly. Now, if he sticks to his hands and looks like a play dough, he was, dear reader. Will have to rush to the market to buy a new one!
Dry yeast is the most boring to test: mix a small amount with 2 tablespoons of flour and some warm water. Wait a few minutes. If the mixture gets spongy, you can celebrate because your yeast is still good!