For 2 weeks.
She burries a lot.
When I exit her from substrate after a long burried period, I put her in water and she stays between 1 to 3 weeks in water, waiting for food and hidden below a fake plant which covers teh water bowl.
Then, after this water period, she goes on substrate and burries for some weeks...etc..
She's fearful and she is unable to stay above the substrate, quiet, as a lot of GABF.

Could it be a problem ?

PS : I don't understand also why she seems so fearful and why she can't stay quiet on the substrate below its hidding bark wood...