Cat won't eat tinned food?

ok your mum has been feeding her crap that is very bad for her if this carrys on this can cause so many healh problems!!!!!! shes gotten used to the food your mums feeding her and now dosnt want tinned food your just going to have to keep giving it to her , also try diffrent tnned fooods try tuna aswell all cats love it!!! hopw this helps ,,x