i believe that kal bhairav is also a rupa of lord shiva so i dont think tht just by reciting some mantra can do this except that its bij mantra as our vedas have given clear warning not to recite any bij mantra without any guidance of proper pronounciation. yes i believe there are some evil spirits who can haunt your dreams. i not an expert on such things but i feel the best solution is to say hanuman chalisa as many times as she can. it really works. and hanumanji also said to be a rudra avatar. so pls trust once on this and try hanuman chalisa atleast for a month. keep faith u will certailnly see the results.
