BRITNEY SPEARS’ mother LYNNE flew from Louisiana to Los Angeles to see her a few weeks ago . . . presumably to make amends.  But Britney wouldn’t even let her into her house.

A source says, “She is furious with her.  Lynne tried over a number of days to try to visit, but Britney just shut her down.”

This happened around the time Britney posted a message on Instagram blaming her mother for giving her dad the idea for the conservatorship.

Britney said, “She secretly ruined my life . . . So take your whole ‘I have NO IDEA what’s going on’ attitude and go [eff] yourself!!!!  You know exactly what you did.”

To make matters worse, Lynne recently filed a petition asking Britney to pay $650,000 in legal fees she racked up during the conservatorship case.