She nicely handed that over.
Yes, you should capitalize "Second Grade" when referring to a specific grade level in a sentence, as it is a proper noun.
I could use quite nicely quite nicely in a sentence today. This box fits quite nicely in the trunk.
An example of a figurative sentence on a second grade level is "I'm so hungry, I could eat a horse." It contains hyperbole.
That little boy is in second grade. She was second to last in the batting line up.
I nicely put my work away.
Mrs. Nunley, your second grade teacher, is tall.
To have courage is to fear something but do it anyway.
We have been cronies ever since we met in the second grade.
It is second grade or you can say 2nd grade.
A predator stalks, hunts, and eats its prey.
Those muffins plumped up nicely this time!
My niece's golden hair is nicely braided.