Britney Spears' mother is staying pretty tight-lipped about her daughter, which is interesting ... because she said a lot in new legal docs about removing Britney's dad from her conservatorship.
Lynne Spears was at LAX Sunday with Britney's brother, Bryan, but neither had much to say about the ongoing "Free Britney" saga.
Other than Lynne muttering that her daughter is doing fine, she seemed to want to keep her thoughts to herself ... but we know precisely where she stands on Jamie.
According to new legal docs, obtained by TMZ ... Lynne says she supports Britney's petition to remove her father as conservator of her estate.
Lynne says she became involved in the conservatorship in May 2019 during a "time of crisis" for which she clearly blames Jamie, saying he had "absolute control" over Britney's money and health decisions.
Lynne claims Jamie hired a doctor to treat Britney, but she and many others believe the doc was prescribing her "inappropriate medicine" she didn't want to take and forced her to enter a health facility after threatening punishment if she resisted.
According to the docs ... Lynne says with the conservatorship in place, the relationship between Britney and her father has "dwindled to nothing but fear and hatred" of Jamie.
Worth noting -- our sources say Britney can't stand her mom as well and they've been estranged for years. Britney also blames Lynne for her current circumstances.
We broke the story ... Britney filed more docs herself Monday, blasting her dad in her bid to remove him as conservator of her estate as quickly as possible.