Grace's poem puts us inside a moment of crisis. The speaker picks up a needle and thread and describes hurting herself, from sewing her lips shut to the cuts already on her arms. The plain, short lines and simple rhymes (thread/dead, more/sure) make the scene feel flat and matter-of-fact, which is unsettling in itself.
The speaker seems overwhelmed by despair and cut off from other people. Sewing her lips closed suggests she feels unable to speak about what hurts, or that no one would hear her. By the third stanza the pain has stopped registering ("I can't seem to feel the pain anymore"), which suggests numbness rather than calm. The mood is bleak, quiet and heavy.
The last two lines bring a small turn. The speaker asks whether she can let go "of this life, and you," so there is someone she still cares about. That doubt is the poem's last thread of hope. If this resonates with you personally, talking to someone you trust or a support line can help.