That's more or less what has happened to me. I too rang immediately as brother in law said she not good with texting. I saw her photo and it's really upset me. She lives 100 mile round trip away. I will go and see her and help where I can. I've just got to get myself in the right place so I don't cry in front if her. Thanks for replying.Welcome @Matilda1
I was estranged from my sister. She was very ill and her daughter phoned me to tell me in case I wished to make contact. I made contact immediately and was able to help her through her illness.
We live miles apart but stayed in contact by phone.
All you can do is make contact. If she has children perhaps you could sound them out first to see how they think your sister might react.
Good luck
HiHello @Matilda1 and welcome to the forum. I am sorry to read about your sisters diagnosis which must be more difficult for you because of the estrangement.
Would the person who told you about the diagnosis be able to say to your sister that you would like to be able to help her. Or could you possibly write to your sister telling her that you have heard about the diagnosis and asking if there is any way in which you could help her.