Agatha left, and now I'm stuck in the town.

Hint 1 of 7:

Look around in the small garden.

Hint 2 of 7:

Get the ladder.

Hint 3 of 7:

There is a seat in the small garden.  Look up by the seat.

Hint 4 of 7:

You see the window which you came from.

Hint 5 of 7:

Use the ladder on the seat.

Hint 6 of 7:

You're on the wall, but you're not quite far enough.