Brooke Mueller's family believes she's more "put together" after checking into rehab in November, Breaking Celebrity News can exclusively reveal.

Sydney Wolofsky, her half sister, revealed to Breaking Celebrity News that she plans to stay in rehab for as long as possible — but Wolofsky hopes when she sees her over the summer, it won’t be at her Utah treatment facility!

Breaking Celebrity News previously reported that Mueller, 39, checked herself into a Utah-based rehab facility following a police investigation regarding her health. Her parents rushed to her side after she was briefly hospitalized following the incident, and have assumed responsibility for her twin boys with Charlie Sheen, Bob and Max, 7.