I can definitely get her down to 25 pounds for a weekender including consumables
The equipment carried would vary, this would depend on why she is out in the field and who she is with. 35 pounds is a safe number to judge the pack

Distances would also vary, as well as shelter, sometimes they will hike to a cabin or other shelter, other times they will be tenting.

It's vague, but I wanted to get her a pack to cover all her bases.
I'm hoping this all makes sense