Sorry to hear about the mishap Loops, i know your a good carer for your fish.
Try and make it clear to your mum that the fish can die from over feeding then tell her how much feed them and why you feed them that much, if anything try make it clear to her that if she doesn't understand your happy to explain but in the meantime no sneaky feeding.
i'm sure things will improve, best of luck.
Awww thanks very much. I appreciate it.
Thats it at the end of the day i just care for my fish