Either RM writers are more confused or Gurumaa as a character is always lost about her priorities.
Why has she helped Damini all these months with her silly tips & tricks, but didn't properly harm T ghost when she had powers?
Instead she was giving R clues as black hoodie person against D, to reach till M's office to investigate T's death.
Now it was so easy for Gurumaa to visit M's house, hide her face, quickly trap & cage a lone ghost in a bottle. What's purpose of caging a ghost suddenly 8 years after T's death, when again Gurumaa easily allowed T to break free from that bottle same day?
latest change is Gurumaa targeting to kill Damini using ghost, instead of getting fully rid of ghost.
Had R not followed Damini to Gurumaa's secret place, she wouldn't have been aggravated to attack R. Does she even know who is her top enemy that she wants to eliminate ghost, D or R?
Now guess Gurumaa is controlling behavior & actions of ghost to turn T from a screeching useless harmless version into a more dangerous version.
Again surely she will flip with her goal.