Rilla is at her first party in Chapter 4 of Rilla of Ingleside. The party degenerates for her, when news of war arrives.

The best of the evening was over for Rilla, too. Ever since Jack Elliott’s announcement, she had sensed that Kenneth was no longer thinking about her. She felt suddenly lonely and unhappy. It was worse than if he had never noticed her at all. Was life like this–something delightful happening and then, just as you were revelling in it, slipping away from you? Rilla told herself pathetically that she felt years older than when she had left home that evening. Perhaps she did– perhaps she was. Who knows? It does not do to laugh at the pangs of youth. They are very terrible because youth has not yet learned that “this, too, will pass away.” Rilla sighed and wished she were home, in bed, crying into her pillow.

This, Too, Shall Pass Away
Lanta Wilson Smith

When some great sorrow, like a mighty river,
Flows through your life with peace-destroying power
And dearest things are swept from sight forever,
Say to your heart each trying hour:
“This, too, shall pass away.”

When ceaseless toil has hushed your song of gladness,
And you have grown almost too tired to pray,
Let this truth banish from your heat its sadness,
And ease the burdens of each tring day:
“This, too, shall pass away.”

When fortune smiles, and, full of mirth and pleasure,
The days are flitting by without a care,
Lest you should rest with only earthly treasure,
Let these few words their fullest import bear:
“This, too, shall pass away.”

When earnest labor brings you fame and glory,
And all earth’s noblest ones upon you smile,
Remember that life’s longest, grandest story
Fills but a moment in earth’s little while:
“This, too, shall pass away.”