8mths old food

I caught my mil feeding carrot cake (dim sum) to my 8 mth old lo. She insists at 8mths old they can eat everything including kfc mashed potatoes. She fed him ice cream before as well. Isit okay for babies below a year old to eat such food? I'm not sure what else she has been feeding my lo behind my back. I'm really worried and told her multiple times, no salt/oily food.