I was mentally going over which electives Maddie might be in (of the ones she's eligible for), and I can see her in:

- Art
- Flying
- Frog Choir (possibly)
- Magical Theory
- Mermish (possibly)
- Troll (possibly)
- Quidditch
- Creature Companions
- Drama
- Dueling Club (possibly)

...and maybe not ALL of these, because she's no Hermione Granger, but those are just my initial thoughts for her.