Don't feel guilty about being true to yourself. Just gently tell her that you need to rest etc. Perhaps send flowers or something like that? If you were close to your uncle, his spirit will always be with you. He will understand. Let go of guilt. It is harder for people to guilt trip us when we love ourselves enough to be true to our core values. We all have people in our life whom we connect most genuinely with--they are the people who are on the same wavelength as we are. It is natural to want to be with people who make us feel good. You are not wrong to do what feels right for you.