Wishing you both much happiness!

Am not sure if helpful, or if this would be somewhere you could visit for reference.

The Alnwick Victorian poison garden is fascinating and perhaps even has ideas for you.

https://www.alnwickgarden.com/the-garden/poison-garden/

https://en.m.wikipedia.org/wiki/Alnwick_Garden

Hope this helps. Am hoping to get to visit one day.

Fingers crossed. They roll around a lot and tell you the world is ending, but after a bit they do eventually adapt!

Keep us updated on how she gets on! Would it be worth trying to train her on a harness/lead for supervised outdoor time?