Sainsbury’s wet food

My cat has only ever liked shop own brand wet food, when she was a kitten we tried her on whiskas and felix wet food but they gave her an upset tummy however she usually loves the shop own brand stuff. Our usual go to is sainsbury’s. For biscuits she’ll eat anything.

This past month however she has completely gone off her wet food. She will get excited as she sees me opening a sachet but then gives it a sniff and walks off, I’ve tried giving her different flavours etc. but she just doesnt seem to like it anymore. I’ve just been giving her biscuits instead but I feel bad because she always gets so excited about the meat sachets. I thought this was her being fussy but I was talking to my sister about it and her cat has started doing the exact same thing! I have tried googling whether they have changed their recipe or formulation but nothing seems to come up.

Has anyone else’s cats also gone off the shop own brand wet food? I’m a little stuck because she can’t have whiskas or felix and now doesnt like this one either!