In addition to salaries being smaller than in major restaurants some things would be more difficult than in normal restaurants, this was because there was a lot of variety in cooking styles, many chefs specialize in just one type of dishes like Italian or Japanese food.
It was difficult to find people who made several different dishes and with the same quality, so she would have to hire several cooks who were good at different dishes with different styles, and the way to deal with these people would have to be different.
But even if Anna complained about the job Jake could see that she was very happy doing it, after all these years she was doing what she liked again, Eva was also very smiling every day which made Jake happy too.