I am a Mum an older Mum with a beautiful daughter diagnosed with breast cancer.

she is currently having chemotherapy before an operation. 

I live a fair distance away so see her once a week. Her husband is  the best . He is doing this with her. This makes me concerned for him , If only I could do more but I am quite elderly and although fairly fit  get tired and achey due to health issues.  I am struggling with worry which makes be feel so guilty. It’s hard to know what to say although I know I help in my small way by just being there and doing a few chores. 
I see her really struggling whilst trying to be positive and am so scared of what this is doing to her. 
She has told very few people and doesn’t want people to know as she doesn’t want sympathy as she wants to be strong. 
Is there anyone else in a similar situation? 
should I be feeling like this? I am so cross with myself.