S.H.
Teach her to use a tissue to do that.
Then wash her hands, as Momma L, said.
She probably has a lot of boogers in there now, since she was sick.
Once my son was digging his nose after having been sick, he said it clogged his breathing. I told him to use a tissue. He did. And out came a HUGE HUGE booger. Then he could breathe, better.
For me, if my kids do that at home, fine.
But they know not to do it in public.
Manners.
But they never get carried away with it.
My son only does that when he is uncomfortable.
But he will use a tissue.