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has she had anything new in the tank that may have her stressed out, or something takin out? i had a friends stimson that was a snappy buggar as he got older, about 2 years old from memory when he started doing the same as your mac. after a while he grew out of it.
Just a stab in the dark, but maybe feed her one big meal rather than 2 or three smaller ones so she is used to getting one food item rather than seeing your hands as desert. i don't know if it would work, im no expert, just a thought incase she's a greedy little mac.
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