When a young lawyer awakens ancient powers that cause her to be hospitalized for a psychotic break, an older woman, in guiding her back to sanity, introduces her to strange realities.

Too vague to build interest. Focus about the plot - what are the strange realities, what is the goal, what stands against the achievement of the goal.

I think you can take out the part where she's hospitalized. That doesn't seem essential in a pitch for this. Also, I learned that one of the general rules for loglines is it must mention the antagonist, and how the antagonist/obstacles are getting in the way of the protagonist's goals.

What dpg said. Also, I find your logline very vague. How on earth did she stumble upon psychosis inducing ancient powers and awaken them? Is it just a coincidence that she's nursed back to sanity and introduced to strange realities by some sort of ancient powers expert? How can these strange realities be shown on screen, and how does all of this tie together and set her on a path that tells the actual, as yet unstated, story?