K.B.
When my mom had cancer when we were kids, I remember people brining over meals for us so she didn't have to cook.
Money donations are extremely helpful to cover expenses that add up even with great insurance.
Daily cards, if you take turns just sending her an email or a card just to say your thinking of her. (Also to get something besides bills in the mail!)
I will pray for your co-worker and everyone close to her! Best wishes!