Hi Ronel
I am also a small woman, 156cm…very short.
I have 2 x Ospreys. 1 x Osprey Tempest 30L & 1 x Osprey Viva 50L and I absolutly love them. They are light, super breathable and adjustable. Ospreys service is amazing and they have a lifetime guarentee as far as I know. My first 12,5km hike with a 11kg bag was so super comfy I coudnt believe it. No shafing at all. I bought mine from Futurama. Heres the links.
https://www.futurama.co.za/osprey-tempest-30-women-s-backpack-s-m-mystic-magenta/
https://www.futurama.co.za/osprey-viva-50-women-s-backpack-cool-blue/
Here is the link for exact sizing: