I don't know -- one or twice a month means you're using it. Plus, the way you talk about it, you obviously LOVE her. If it were just sitting in your closet and not being used, I'd say lose her, but to me, feeling extra special twice a month (24 times a year!) because you're using a bag you love is worth it. Every woman should get to feel like a princess once or twice a month, right?
After 15 years of marriage, I only use my husband once or twice a month, and I still keep him . . .
If I had a bag and used it only once or twice a month I would definitely lose the bag... TBH, if I had my HG bag, I know that it would be used more than once/twice anyways because then whats the point of having a HG bag if you don't use it, KWIM, so I would definitely get rid of any bag of mine that I don't use often, that is why my collection has slimmed down dramatically because I refuse to keep bags I don't use anymore...