Judging by the imagery, the speaker is grieving or recovering from a lost relationship, and she is not coping as well as she once believed. The opening admission, "I am not stronger / Thought that I was," sets a tone of quiet honesty. Something stronger than her has broken her "brittle bones," and the memory of "you" keeps catching her off guard at the edge of her vision.
The images pull in two directions. She calls herself "sugar and tear drops," which is both sweet and sad, yet she can still "spin circles," burn pictures, and try to remember someone else's name. These small acts feel like attempts to move on. But she also wants to "fall down sweet" and weave her memory into "the story of you," so she is still tied to the past.
The mood is tender, tired, and wistful. The ending, sitting down to look for daylight in sunshine "that never shines through," suggests she is settling into her sadness rather than escaping it.