Holiday guilt

Hi all. My mum was diagnosed with stage 4 lung and kidney cancer in march this year. She's got other health problems so is only suitable for immunotherapy but is doing well on it. She's getting out in the car and using her mobile scooter, and is able to go things at home.

I'm due to go on holiday to New York next month for ten days. I feel so guilty about going, and worry about something happening whilst I'm away. My mum is happy for me to go, and at the outside the oncologist did say to her you could have four months up to four years of life. Any advice or opinions? Thank you