sell or keep?

use her often for a couple of weeks and see if you change your mind. personally, i would really have a hard time deciding also but if you want to be practical, and eyeing another bag, you can sell her (i can't believe i'm even typing the words!) and buy another bag that you can use more frequently.
 
What about a glass shelf in your bedroom, but out of the sunlight? That way even if you don't use it often you can still see it and enjoy it. It sounds like you've decided to hang onto that beautiful bag, so why not put it someplace other than the closet?