C.S.
It is sad to say that some people don't feel the need to have manners. Sometimes, these people have some kind of an inner belief that if they say they "Thank You" to people and show their appreciation, they are accepting the "need" for that person and their service - hence, they are not sufficient on their own - lowering their status. Is sounds unbelievable I know, but there is something about bringing themselves to the level of the service provider taking away their status. By tipping them well, they are establishing their status with money while "thanking" them which doesn't knock them down from their pedestal. The services provided to them are "expected" because of their high status and somehow those people (service providers- servers, door openers, etc) owe them those things. That is an analysis that isn't easily noticed. Your friend may need to learn more about accepting everyone equally even moreso than manners. Find a way to tell her lovingly that although she has earned her way to her status, that we all are the same in God's eyes. We all need to be shown value, validation and worth. They are basic human needs despite status. I pray you will be able to convey that to her without making her feel that you are putting her down because otherwise, you would be doing the exact same thing with her. This one won't be easy, buy you can do it!