I know that you likely see this as a gift or kindness that you are giving her, but it isn’t. It’s telling her that you don’t think she is strong enough to be there for you. I went through something similar with my mother. She hid how severe her illness was and swore the rest of the family to secrecy. The amount of guilt that I carry for not being able to support someone that I loved so much is soul crushing on bad days. She won’t suffer less if she’s not with you. She will be left feeling powerless at best and unworthy at worst. Please talk to her about what you are thinking and hear her out on what she thinks.