Thank you everyone for your input!!
It really got me thinking about what to buy. I think Julia will be carrying about 30-35 pounds and weighting about 100 pounds herself, I don't think the bike will be under too much stress. However since we're planning to go touring along Elbe river in May, there's really no time left for me to look for a bike. I will still need/want to overhaul the bike before we go and it might take some time. However the most important factor would be if the bike fits her.
She already has her Brooks B66S saddle which I believe will provide good comfort.
We're going to see Koga tomorrow and if she likes it we'll take it.