Chyna's business manager took control of the late pro wrestler's stuff -- including a $5,000 cello -- and there's no telling what he's doing with her other valuables ... so claims Chyna's mom.
According to docs obtained by TMZ ... Chyna's mother is asking the court to give her power to handle her daughter's estate and to keep her "purported friend" and manager, Anthony Anzaldo, at bay.
Chyna's mom claims Anzaldo is meddling in her daughter's affairs with no right to do so. She also thinks Chyna should still be collecting royalties from over 100 film and TV credits, but Anzaldo is making it impossible for her to follow the money trail.
Mom not only wants to control the estate, but she's asking the court to block Anzaldo from "usurping" her efforts.
We reached out to Anzaldo ... so far, no word back.