I'm going to give Britney's father some latitude here. Adult conservatorships can be very difficult to manage, and there are often conflicts between the ward, conservator, guardian (if separate from the conservator), and other parties in the ward's life.

But remember this: conservatorships are overseen by the courts. In my state at least, conservators are required to be bonded and account annually for the management of the ward's estate, so I think it probably not true that Britney's finances have been mismanaged.