Perhaps I am misinterpreting this. Are you not 'company' too? Are you not being asked to join in and be part of a larger group? I would feel glad that my friend is thinking highly enough of me to include me as a friend amongst others and family members. I see this as her thinking you are an equal and that being asked to participate within the larger group is a privilege. It may go against what you are feeling but are you able to turn this around on yourself and see and feel that you actually are being extended a kindness? Self-isolation is such a problem for many of us. Perhaps you might find the strength to bring yourself to take advantage of these situations to combat this.