Honestly, I think you missed the boat. She's retired so she may not even remember the cafe incident, let alone school years. It may create a bit of anxiety for her:

1. She may not remember you at all
2. She may feel guilty you've over-extended yourself to her, not knowing who you are
3. She may feel uncomfortable you've tracked her home address, crossing boundaries between teachers and students
4. She didn't recognize you at the cafe
5. Stress