^^^^ Mindreading. Don't do it. IL parents will often be in your corner, but WAS won't listen to 'you should go back' coaching. So likely MIL won't keep saying that to her at this stage. I would tend to think the 'something' would just be generic. Take the fact that it was a friendly response and don't dig for meaning.
M: 43 W: 43 Married 6 yrs. T: 7 yrs. Son 20, 18, 17, 15 yrs. (w/ Autism), 12, 10