Another vote for Savanna 2 (now called Santiago) that my better half has. It has special women cut versions for wide spectrum of sizes available. Make sure you buy it WITH the gore-tex inserts. Quite expensive kit together, but top quality suite, coz you know female bodies are more temperature sensitive than the male body (scientifically proved BTW). When it is hot they complain, when it is cold they complain... And YOU is who to blame
Savannah-Santiago is just for those huge temperature changes with the goretex inserts. And good plus for the BM kit is they look stylish compared to most of other makers suites inc. very expensive Rukkas etc, so she has to take ALOT less clothing stuff with her (my long term experience
For the very cold conditions i also recommend buying heated vest for the both of you, ideal would be if you get the heat regulators as well. On the very long colder day rides they are definately the top piece'o'kit bringing smiles back into your faces!