I agree with Stitchthis.
Cherry is used to sharing her life with her blog and her readers, so it is a natural progression for her to share the news of her husband's cancer treatment. It would feel strange for her not to do so.
He has presumably given his permission.
LocalH
Everyone deals with the shit that life throws at them in a different manner, Cherry is dealing in this way.
I actually think more of her for doing this. It shows that she is genuine. She is not just showing off in the hope of getting a book deal out of her blog, she truly does share her life with her readers. It may be a bit twee and prettified, but it is her life and her blog.
Good luck to her and her family.