So I am going to suggest if you have another pot to flip it upside down and put it under the pothos so it is higher up. If you have fake plants you can hook them to the sides of the outside of the enclosure for her. This will give her some sense of security as well.
She is on the floor because she is not feeling safe.
So with the gauge being on the floor is this how you are telling your temps and humidity? IF so this will not be accurate for basking temp and the humidity will be higher down on the floor then mid to top.