What one request does Dimmesdale make to Pearl? What happens to Pearl to when she fulfills his request?

From the text:

"dear little Pearl, wilt thou kiss me now? Thou wouldst not yonder, in the forest! But now thou wilt?"

Pearl kissed his lips. A spell was broken. The great scene of grief, in which the wild infant bore a part, had developed all her sympathies; and as her tears fell upon her father's cheek, they were the pledge that she would grow up amid human joy and sorrow, nor for ever do battle with the world, but be a woman in it. Towards her mother, too, Pearl's errand as a messenger of anguish was all fulfilled."