1. Frog Drop: patience, you will get there!
2. Limit Glove: with rebirth ring and auto-life blue magic, you can get 9999 early in game!!!
3. Auto-life: see above
4. Migthy Guard: shell and protect on everybody is a must (despite the high MP cost)
5. Nigth: useful with insomniac on party
6. L5 Death: Kill Grand Dragon with 1 hit!!! (he's lv 30)
7. 1000 needles: By the time that you get it, is pretty useful
Quina is really an understimated character, s/he got high HP, high MP, good attack power. The biggest down is s/his Trance wich is the worst of all.