I think you need to be a lot firmer with this mom. When she comes in and says "maybe you should feed him X for lunch" say "actually we are having X today" if she wants him to go to bed later tell her 7pm is the bedtime at your house. Implement a late fee so that if she is later than 11:30, it won't be for free. She keeps pushing you around because you are letting her. You should be running your business the way you see fit and if she doesn't like it she can go elsewhere.