From the look of the net there's a bit of algae in the pond why don't we start with some pics of the pond@Hampstead Hello and welcome, but sorry that you’re here for this reason.
This looks like carp pox, which under normal circumstances isn’t fatal to the fish. Most of the time, fish deaths are caused by poor water quality…..so that’s usually the best place to start……with some questions…..
Unfortunately, it’s almost impossible to diagnose a fish problem from just a picture. It would be more helpful if you could give us some information about your mom’s pond, such as how big it is, how many fish she has, how long has her pond been up and running, filtration, has she recently added any new fish, or has anything changed recently?
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