I know this is going to sound strange, but I happen to agree with this. Everything God has commanded us to do is for our benefit and happiness-and that includes the worshiping of Him. When we fail to follow His commands we are actually going against those things that make us happy.
Deu 5:33 You shall walk in all the way that the LORD your God has commanded you, that you may live, and that it may go well with you, and that you may live long in the land that you shall possess.
I agree with you (and some of the other posters). She seems to be saying, in a somewhat garbled way, that God does not need us to worship Him: we need to worship God. To say otherwise would be to say that God is incomplete without our worship.
In the same way, God does not "need" our good works. He could cure disease, feed everyone, and so on purely through His own power. However, He does not: He choose to allow us to participate in His work of healing and restoration.
So if you are doing it for yourself, why keep doing it if it doesn’t get you what you want? The first time you don’t leave church “happy”, why go back?