She has acknowledged that the arrangement was necessary when it began, and probably saved her career, and she remained silent both in public and in court for nearly all of its existence.
But starting in August she began publicly seeking to choose who oversaw her life and money, asking for greater transparency in the court's often secret moves, and even declaring that she was sympathetic to fans who have increasingly demanded in protests and online posts that those in control must #FreeBritney.
James Spears and a co-conservator, attorney Andrew Wallet, ran the conservatorship for 11 years. Last year, Wallet stepped down, leaving James Spears entirely in charge. He soon temporarily stepped down as conservator of Spears' person, citing health reasons, but kept his role as conservator of her finances.
In August of this year, Britney Spears said she strongly objected to her father returning as conservator of her person, and wanted to make her approved replacement, Jodi Montgomery, permanent in the role.
In September she went even further, asking that a corporate fiduciary, the Bessemer Trust, become conservator of her finances instead of her father.
James Spears first filed to have Wallet return as his co-conservator instead, but Wallet withdrew after Britney Spears objected.
James Spears subsequently said he would work with the Bessemer Trust, but now Britney Spears is insisting that such an arrangement would be "doomed to failure" and her father needs to be out entirely.
In documents filed by her court-appointed attorney for the conservatorship, Samuel Ingham III, Spears said her father was clearly planning to attempt "to retain full functional control of her assets, books and records in the face of Britney's objections."
She also cited his recent failure to notify her that her business manager had resigned and he had appointed a new one, and said she plans to object to the accounting reports that will be made at Tuesday's hearing.
In his own filings, James Spears argued that he has done his job well, taking the estate from being in debt and facing tens of millions in lawsuits to its current value of over $60 million.
"Mr Spears is doing exactly what he is supposed to be doing as conservator of the estate; he should be commended, not suspended," one court filing said.
James Spears did all this, the filing argued, while working hard to restore his daughter "to good health, reunite her with her children, and revive her career."
"Throughout his service as Conservator, Mr Spear's sole motivation has been his unconditional love for his daughter and a fierce desire to protect her from those trying to take advantage of her," the filing said.
It is not clear whether Judge Brenda Penny will make any decisions today. She may seek time to reach decisions or ask that arguments continue on another date.
Spears is expected to take part in the hearing by phone, as most or all of the participants will as allowed under the court's Covid-19 pandemic guidelines.
The proceedings are likely to be closed to the public and media, as Penny has routinely done at the request of James Spears and his attorneys, who have argued for his daughter's need for privacy.
But in her recent spate of filings, Spears has said she has gotten more privacy than is good for her, arguing that the secrecy has not been helpful, and welcomed the scrutiny of the #FreeBritney movement, which her father has scorned.
In court documents, Britney Spears said, "Far from being a conspiracy theory or a 'joke' as James reportedly told the media, in large part this scrutiny is a reasonable and even predictable result of James' aggressive use of the sealing procedure over the years to minimise the amount of meaningful information made available to the public."
- AP