I would agree with the above based off the limited info you gave.
If a Chameleon has all they need in terms of temp, food, environment, etc, they are pretty content to just sit and watch the world go by.
It is funny you mention this, today was a day like that for one of my Parsons. She got up, ate, moved to her basking spot, and then moved down to a spot and just kinda hung out there most of the day.
Just a day in the life of a chameleon.
Watch her however to make sure it does not become something more long lasting.