Final answer:
Mrs. Weissmann visits the cemetery to remember and perhaps find closure for a personal loss, symbolized by an unmarked grave and lavender daisies.
Step-by-step explanation:
Mrs. Weissmann's decision to visit the cemetery after Arthur leaves home seems to stem from a deep sense of remembrance and perhaps from a need to connect with a painful part of her past. The mention of an unmarked and uncared-for grave, accompanied by the small bunch of pale, sweet lavender daisies planted by Jane, hints at a personal loss for which Mrs. Weissmann seeks solace or closure. The act of visiting the cemetery serves as a symbolic gesture to honor and remember lost loved ones, even amid the loneliness and starkness of the resting place described in the passages.