I have friends for very many and for just a few years. My oldest and once best friend and I used to go on holidays and look out for each other. In the last few years she has become so lacking in showing any empathy. She has become very into her local community church and spends her time with them. She cancels meeting up saying she can't do "X y z" because of something else without seeing she has made a choice in her selection. It's come to a head now because I am unwell and my other friends are coming to see me, delivering food, going to hospital appointments - she knows exactly how unwell I am and hasn't offered anything in fact she called and it was so awkward because she just didn't offer any help at all nor to just visit. I have to focus on myself and getting better now, but seeing her annoying messages in our WhatsApp group blind to what's going is really upsetting. How do I deal with this ?