Sure, therapists might be busy, but if they are too busy to consistently remember key facts, that's an issue worth resolving. I think knowing your husband's name, if you have mentioned it several times, is a reasonable expectation. I would bring it up with her as I would definitely care and be concerned about her attentiveness. The therapist doesn't need to remember your favorite color, but they do need to remember your history- they can't just do the deep work if they don't hold a sense of the bigger picture, and it sounds like hubby is a huge component of yours.