Answer:
happy or cheerful
Explanation:
lightly most likely means she is carefree which is a happy calming trait.
she was also smiling and skipping which means she happy and also shows hints of innocence
"Don't worry," she whispered.
A complete verb includes the main verb and all of the helping verbs. The helping verb in this sentence is "has," and the main verb is "mailed." "Not" is never considered a verb. Therefore, the complete verb is "has mailed"