The way I understood ShinHye was, friends would extend a helping hand, "even cleaning fingernails" so to speak.
If a person is not too close or comfortable as friends with another, it is far fetch to even think of doing such a thing. There is a phrase: "I will even bend backwards. . ." it is in the same token.
we maybe surprised but not all times, our fingernails are "clean", there maybe a speck of dirt or tiny knot that may be under the nails unnoticed until we see it when washing our hands.
Besides, Shin Hye was known in YAB as being 'motherly' to the ANJELLs. She was even seen preparing 'healthy' drinks for them at the filming site (pool)
and both Irish_Law and Tata have a point. They are good and true friends after all.