If I was in your shoes I think I might take the suggestion about a "Creative Writing" Class at the local Community College. But I would do it with her, make it a 'Couple' thing -- a time once a week or a couple times a month for you to both go out and take the class. It will display to her that you care about her writing and want to experience it all at her side. Maybe you doing it with her will give her the support to not be afraid of any possible criticisms.
As Husbands and Boyfriends, sometimes we have to take one on the chin and do things that we may not be all that interested in because our significant other has great interest in it. Also, we always have to note that your writing may be terrible and will make hers look better maybe boosting her confidence some.
My Girlfriend enjoys pottery, we both took a class on it a couple years ago. She was actually very good at it where as me-- I was atrocious. Everything I made looked like some kind of ashtray that caught on fire and someone put it out with a hammer. My Girlfriend really liked the class and LOVED giving me tips on how to better my pottery prowess. It was a fun activity that we shared.
"I have always thought of Christmas time, when it has come round, as a good time; a kind, forgiving, charitable time; the only time I know of, in the long calendar of the year, when men and women seem by one consent to open their shut-up hearts freely, and to think of people below them as if they really were fellow passengers to the grave, and not another race of creatures bound on other journeys." ~Charles Dickens