Since it sounds like you are going the be boarding alone I am not sure I would recommend Baker unless you could meet up with someone there. It is a mountain that if you go off trail you can get in serious trouble and don't want to be alone, especially if it dumps. Stevens seems to be your best bet. They have nice terrain and some good stuff, and also easier trails for your wife.
But if you can get someone to go with you are possibly meet someone on here to ride with at Baker, that would be the easy choice as long as there is some fresh snow.