While sacking her seems a bit extreme, I think this is very emotive one.
On the one hand we have some elderly people who don’t want to use a bank card and want to pay with cash, and on the outside, a bakery employee helps this by paying for their shopping on her card and then taking the cash from them. So far, so altruistic.
But one of the reasons why these shops are discouraging cash isn’t just because of the staff handling it, it’s because of the customers handling it. And by doing what she did she went against their procedures, because for every customer who put their cash in her purse, and then selected their change, that was someone handling cash that had been handled by a different customer, so against the rules of the shop.
As an employee her job is to do the sales, and to also uphold the rules. By allowing various customers to handle what could be contaminated cash on the shop premises, she has directly broken the rules.
The elderly are in one of the most vulnerable categories. Imagine if one of these elderly people caught COVID and died from it, and it transpired that they had caught it from cash dispensed in a shop who had a specific no cash policy to avoid that from happening. There would be outcry.