Hi there,
I'm not a Raven owner, but have bought a couple of Thorn bikes, so may have some useful advice.
A couple of observations;
Thorn bikes have really long steerer tubes, so getting a large frame for a high handlebar is not necessary.
The most important dimension to get right is the top tube length. Given your measurements, you and Laura have different needs in this respect, as her upper body is a lot shorter than your's.
My suggestion would be 562S and 512S, but don't take my word for it. Robin has a huge experience in this respect.