I can feel that there is a spirit following me at times but all i know is that the spirit is female because i can hear her at times when i sleep. Is there a spell that can help understand who she is more and what her intentions? And if needed, a magic circle design to enhance the power of the spell?
i don't know of any spell, but you could just try talking to it. you seem to already be able to hear her, so you could communicate. you could also work with skrying or pendulum, the spirit will appear, or symbols to answers will appear, while skrying. with the pendulum, the spirit will channel through you to move it. talking to the spirit directly would be the best approach. if you want to be safe, cast a circle, or wear a charm.