For myself, the max time a child would be with me is 4 years. If they have another child in that time than I'd consider raising it for the next child if need be to match the highest fee I am charging others. However, just like in any other profession, you eventually cap out and reach your maximum wage. For my area, I'm there already so I don't see an increase in my fee anytime soon.

However, this provider in her area, sounds like she still has some leeway for a raise!