After I posted my comment I thought about how it could be, legitimately, construed as doing it for the wrong reason. And, given that Victoria Osteen stated it, I certainly wouldn't put it past her that this was her intent. "If I worship God, then I'll be happy." So, in that sense you are both correct.
OTOH, I will still stand by my statement that every command in scripture is given to us that our joy may be full. That doesn't mean we will have riches or health or things of this earth. It means that we will have peace and happiness with God regardless of the situations around us. And God wants us to worship Him not so that we get something back. We worship God because it is for our benefit.
So, yes, worship is for our happiness and we should do it for our happiness.
“joy may be full”
Joy is not happiness.
“worship is for our happiness and we should do it for our happiness.”
So if we don’t leave happy, worship has failed.