In early April reports emerged that Spears had suffered a emotional breakdown related to her beloved dad Jamie's increasingly serious illness.
TMZ said at the time she would remain in the care facility to complete a 30-day treatment programme.
The mother-of-two recently put her Las Vegas residency, Britney: Domination, on hold to take time out with her dad who, by her own admission, she shares a "special relationship" with.
Spears' father has undergone two corrective surgeries on his intestines and colon but reports indicate the most recent operation resulted in significant complications.
The iconic singer's children, 13-year-old Sean and 12-year-old Jayden, are splitting their time between dad Kevin Federline's home and their mum's house where they stay with a caregiver, Daily Mail reports.
Since 2008, the troubled star has been under legal conservatorship administered by her father because of issues with her mental and physical health.