Sources with direct knowledge tell TMZ, Britney's mental state is much better than it was when she checked in. Recall, the singer was distraught over an illness her dad was battling ... made exponentially worse by the fact the meds she'd been taking for her mental illness stopped working.
Doctors were trying to find a new combo of meds, but they couldn't get the mixture right and it was doing Britney more harm than good ... to the point she stopped taking them.
Their sources say doctors still haven't figured out the right formula and call it, "a work in progress."
The sources are quick to say, Britney did NOT check into the facility to get her meds right ... it was to get her head straight. They are told she's doing "a lot better" in that department, but the doctors continue to work on the cocktail of meds.