Hide in her pack

That's it! An adventurer is perfect! You need to find creatures you can fight to level up, and she is prone to find them. You just need to find a way to stick with her without being noticed...

Her bag!

Just a few paces from her resting space next to a large rock, something similar to a hiking backpack sits with items that essentially scream adventuring equipment. The idea has seeded itself in your mind, leaving you only to act upon it.

The mission: Find other creatures that are relatively your strength (which you aren't quite sure of at the moment), to fight, defeat, and hopefully level up.
The method: Borrow this adventurer as a free ride to where those creatures might be. Sneak out of her bag once she starts fighting one.
Profit!

So acting on impulse, not wanting to squander your opportunity by wasting time debating if it is a good plan or not, you bounce to the bag and with a modicum of effort **** your way into the largest space through the top. There you forcefully settle yourself down into the bottom to hopefully avoid her discovering your if she reaches in to grab one of her things. Luckily for you, you don't seem to be leaving any form a moist residue on the items you pass over, and that pass through you.

So, you wait.

And wait..

and wait... You swear at one point you even hear her begin to snore.

You feel like you had been waiting for an eternity, and honestly begin to wonder if another monster came by and ended her in her sleep, leaving you in her bag. Unfortunately for you, the confines of the bag have limited your perception to only be it and its contents. This unfortunate state of blind waiting brings you just to the edge of wanting to climb out and investigate if she is still breathing, or even still there, when you hear motion again. The sound of her sitting up and stretching, releasing a cute little yawn before yelling, in a language you don't understand, "Oo nh! E ivsr oltpe! mldtr ilusg ng gsiig ob bt rufousi."

Suddenly you feel movement. The bag you are in is forcefully hoisted and the person carrying it is in a full sprint the very next instant. This continues for a few moments, but who ever is carrying must actually be merely human as you feel the sprint slow to a walk and can hear the girl's voice again, heaving to catch their breath. From then the ride is slow and rhythmic, similar to your bouncing, but with shorted movements, her short strides almost swaying you and her back as she must still be maintaining a brisk pace.

The continues for some time, until you begin to here sounds you are familiar with. Sounds that you recognize not from this lifetime but your last. Sounds which are very similar to the looping noises that would play when you would enter a town in an RPG. Not the music but the sound of carts rolling on streets in the distance, a smith's hammer falling against heated metal, and the clatter of numerous gatherings of chatter all around.

SHE TOOK YOU TO TOWN!

This is not good, not good at all. This is almost the exact opposite of what you wanted. No, you are pretty sure this IS the exact opposite of what you wanted.

Ok. This, is fine, you can get through this. You just need to stay hidden and wait, maybe she just needed to drop something off...

BUT YOUR IN HER BAG!

You were going to try to hide, but are pretty sure that if she actually looks into her backpack there won't be a way for her NOT to see you.