Her medication is working well, she said.
Stella executive produced and masterminded Mariah's reality TV show Mariah's World.
But Elusive Chanteuse dropped Stolper like a hot potato in November 2017 when she signed to JAY-Z's Roc Nation.
This is when she is understood to have dropped Stella from her immediate team.
The source shared: "There was a small group of people who really cared for her, personally".
Stolper, a former comedian, became Carey's manager in 2013 and served in that role until previous year when they parted ways when Carey signed with Roc Nation.More news: Chopped Romaine Lettuce Linked to E. Coli Outbreak
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O'Donnell points to Mariah's infamous New Year's Eve meltdown - where she blamed her disastrous performance on equipment malfunction.
Insider claims that he had been "orchestrating Stella's exit for a long time" were considered "without merit" by Mariah's people.
Carey revealed last week that she was diagnosed with bipolar disorder in 2001. "It's not making me feel too exhausted or sluggish or anything like that".
Carey, who is divorced from actor Nick Cannon and shares 6-year-old twins Monroe and Moroccan with him, said she made a decision to go public now because she's "just in a really good place right now, where I'm comfortable discussing my struggles with bipolar II disorder".
"I got back to doing what I love - writing songs and making music", the mother-of-two said.
With over 200,000 confirmed diagnoses per year in the United States alone, bipolar II disorder is more common than realized. "I was irritable and in constant fear of letting people down".
Carey's ex-husband, Nick Cannon, reportedly expressed pride that she went public with her condition.