I need to rant!!

My mum came to visit me and her 8 month grandson from Spain where she currently lives. So she came and for last one week she keeps complaining about what I am giving to my child, how I'm making him sleep and has just thrown my routine over the window. She has given him sweets (SWEETS!) and whatever she is eating. And she keeps complaining about what I do or don't do. I understand she's the grandmother but I have struggled for the past months to introduce a routine and she keeps bugging me about everything!!! I don't know what to say as she is my mum but my patience is running out.