Reel is a homophone for the word real. Even though the words are spelled differently, they are pronounced the same. Homophones are words that sound the same but have different meanings. Real means actual; not imagined. Reel is a spool on which thread is wound. You can also reel in a fishing line.
The verse of the poem shown above shows us how the memories of the speaker's mother reach him. His mother no longer exists in the material world and is in the celestial world and this can be seen when the speaker says that she shares at dawn and that he remembers things that she used years ago, before her death and departure.