This is absurd.

After an indefinite amount of time, riding the shifting current through...wherever you are, your frustration is reaching a tipping point. You weren't sure what exactly you were trying to accomplish but you were making zero progress.
First you were nothing: a vague idea trapped in the girls head, watching her life flash by without any interaction whatsoever.
Then you were in control: you had a body, a life, even if they weren't your own...but the girl's own mind was repressed.
Cohabiting her higher processes obviously didn't work: You'd though her train of thought would rip you apart just observing and it seemed like she didn't even realize you were there.
Which left this...whatever this was.
No matter

"AAAGH!" you scream, venting some of your built up emotion. Of course, you failed to realize venting your emotions inside someone else's head might be a bad idea. The ocean of emotion around you seemed to pulse an angry red and the current whipped up viciously in response to your outburst. As you clung to yourself, trying to stay in one piece amidst the gale, you bit down another scream of frustration. Eventually the tempest subsided but didn't return to its previous calm. The "water" got colder and you felt a definite chill of sadness.

Fuck it. The upper regions were better than this.

...Now how are you going to get back?

Could you climb? Swim? These were physical ideas for a nonphysical place you were never meant to exist in. For the first time since you arrived you focussed on "you", your shape within this girls mind. Easier said than done considering you had no conventional senses to examine yourself with. You felt...amorphous. Like a ball of thought and personality that changed shape to surf the emotion ocean. Maybe you could just...Stretch?

Elongating yourself, you spread out over what felt like a large area, having to carefully watch the currents so they didn't tear you apart. It seemed to work, you felt yourself in contact with more of the girl and it became easier to understand the emotions you were surfing. She was definitely sad, probably in response to something that happened when you inadvertently angered her.

Ok, let's try going...up?

There was no gravity so "up" was subjective, you picked a direction and started expanding. To your relief you seemed to be made of sterner stuff than you expected, you had no trouble spreading yourself out through the mess of currents. Before long you started to feel glimmers of...thought?

Excellent. You were moving in the right direction. This new approach changed everything, you could still feel the chilled currents of sadness below but you were also catching complex thoughts and even a few images from above. Your problem before might have been that you were trying to exist in only one of these places, maybe the key was spreading yourself out. The hurricane of thoughts is easier to navigate now that you have a solid root in her subconscious and you find yourself dodging thought streams as you try to reach her senses. The first part of making a plan is knowing what's going on.