Hi and thanks for the query,
I think the rinsing of the eye with clean water was already a very good idea. There is certainly for an inflammation of the eye, reason she has stony feeling in the eyes. For now, she could take any oral anti inflammatory drug to reduce inflammation and pain, and if there is any topical eye drop
anti inflammatory drug or eye drop, it could be most welcome. However, taking an anti inflammatory drug, avoiding to rub against the eye as much as possible is sufficient till she get to see her optician tomorrow.
thanks and best regards,