Hi there,
as I understand it (I work in Norway) Sweden has fully implemented EU-OPS Subpart Q.
So her rest should be based on 12 hours at home base (is the UK airport registred as her base?) or preceeding duty if longer. 10 hours or preceeding duty if it is not her base. Believ there is no difference between pilots and cabincrew.
CAP 371 is based on Subpart Q as well but more strict, so she should be able to work more hours than you. That is unless there is any collective agreement saying anything else of course.
Stand to be corrected.
Rgds