Obsessively stimming 3 yo ASD girl

Hi all, 

i know stimming is good for ASD children as long as not self harming. However, recently my girl has obsessive stimming by moving her fingers in front her eyes all day long. I  am concerning by doing this she is shutting her world and no learning anything She is already seeing OT on a weekly basis, Amy advice on what can I do to help her please?

Many thanks!

worried mum x