Hey
She looks a little small for the 10 gallon yet.... maybe build her up a bit more. Try some root strengthening, Superthrive and a more roots type product really helped my slow babies.
If you do go to the 10 gallon just be very wary of overwatering...even with the fabric and fast drying it might be a bit irritated in the first couple weeks.
Have you been giving any low low doses of nutrients? Even just some kelp powder might be nice since it's pretty gentle. Ph is good?
Those are the only things I can think of.✌️