Can you post pictures of her arm?

She will definitely grow accustomed to the extra space in the 10 gallon but I do not recommend a tank mate for a 10 gallon - it is too small to house two ACF.
Make her environment "softer" with sand substrate and live plants. Even moss balls are fine. She does not need "hides" as she cannot see to find them anyways - cover is to disperse light/shadows as they have no eyelids but this is not needed in her case.