Selling food from home

My mom does a private catering business from home and sells food from our house to the customers. Recently a food organisation has contacted my mom for her to sell weekly food to them so they can serve their customers this food. Is this allowed in Islam? Because the customers of that organisation don’t know who makes the food (if the organisation makes it or someone else) My mom is saying that it doesn’t matter where the food comes from because when you go to a restaurant no customer asks who cooks the food and where it comes from?