You've already been too tentative. I would recommend:
1. Show up at her class this afternoon with flowers.
2. Then at her house this evening with another thoughtful gift.
3. Then a few texts before bedtime telling her she's totally hot.
4. Then a nice box of hot donuts first thing in the morning -- 5 - 5:15 a.m. so she knows you're an early bird that's out earning and making it happen early.
5. Then follow her to school, just to make sure she gets there safely.
6. More flowers in the morning.
7. A nice pizza delivered to the teachers lounge for lunch.
8. Now you set the hook. A shoe polish or shaving cream-written marriage proposal on her windshield when she walks to her car after a long day is a pleasant surprise for any teacher.
She should give you some feedback by this point.
I would give more details, but someone's here to serve another frivolous protective order on me. You're welcome, and best of luck.
Screw all this nonsense and mindless drivel. Takes too much time. Just step up to the plate tonight and go for the home run!