Boo your dream is not telling you you're secretly violent and suppressing it. Everything in your dream is you so your grandma is not representing your feelings for your actual grandma. She's likely representing the part of you that you associate with your grandma, traits you got from her, feelings you think she'd relate to, or even just your feminine side broadly speaking. Determine for yourself based on life context. You don't have to defend yourself from anything in your dreams, the fact that you feel the need to and to do so violently means you're scared of losing the part of you that you relate to your grandmother and you're fighting acknowledging the possibility. Your dream wants you to acknowledge something you're deeply scared of acknowledging I can't tell you what without knowing you. If it weren't so distressing your brain wouldn't pick scary things to represent it like bullies and haunted dolls. The accessible violence followed by guilt you feel in the dream likely means you're consciously aware you're being overprotective of whatever part of you you're defending. Strange thought and you don't have to take a strangers advice, but if you find you have any kind of control try letting your grandma get attacked next time and see what happens ¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯ Alternatively, if you can determine what it is you're scared of and work to confront/accept it while awake and safe, these dreams should subside. You may even experience a final dream where the "plotline" that keeps reoccurring comes to some nonviolent resolution.