Ask. Include. Be mindful of the the time and energy you expend on her, she is probably exhausted. Let her know you miss her, make a video for her to enjoy at her leisure, maybe get your group to do something appropriate but non-invasive, like putting together a seasonal basket of Chanukah related stuff for her to enjoy. Don’t push her on participation, but offer the opportunity. She’s really tired, and sick, and probably somewhat frightened, and has to expend a lot of energy reassuring her loved ones that she is in better shape than she is, but I guarantee that she will be delighted to know that she is valued and missed. She won’t feel worse to know you are practicing and carrying on with the tradition. Speaking from experience, here.