Poor Britney.
I think it's a nasty combination of mental illness and drugs. I worked with someone for years who developed a drug addiction (it took quite a few years for it to be noticed at all, despite seeing her every day. I now understand what a functioning addict is and how until you see it, you don't really see it). Britney's Insta reels have always reminded me of how this women looked, dressed and behaved once her addiction really took hold.
Everyone at work tried to help this woman once it became clear to us that she was, by then, a drug addict. We tried everything - she resisted everything. She had debt but what finally compelled her to leave the area was being in debt to very dangerous people.
There is a marked deterioration in how Britney looks and is moving the recent 3 videos on her account. I don't know much about her family but I do think it's unfair to ask where her sons are in all of this; I think that they would have tried along with other people to help her.
Britney presumably has enough money to pay for people to do as she instructs them to do (enablers). I don't know how anyone could possibly get through to her when she has the money to buy a ring of security around her to protect her wishes and the way she wants to live her life. The Instagram videos are distressing for the world to watch so must be incredibly hard for her family and the people who love her.