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Sorry for the delay Dave!
We have an update, my Mam's warning has been destroyed, the rest of the employee's now realise the boss is, in short, 'useless', they trust her less. Luckily they all saw my Mam was in the right.
In the end, my Mam is happy at work, her boss knows she can't mess her around unfairly and the others workers know the boss' tempermanent and are bit more wary, simply as they don't want warnings!
Plus, more importantly, my Mam feels more confident at work. Not so much that she's going to pick a fault everything her boss puts forward, but that she knows her rights and can fight for them. This whole episode has really taught her boss to be more fair, or the other workers, including my Mam, will support eachother. Basically she's a really crap boss, but if the workers do their bit and she does her bit, they all get along.
Thank You for all the help :o)