Hope you are doing well. The best thing to build up a low red blood cell count is iron. Either with OTC Ferrous Sulfate or red meat. Please have your friend check with her doctor on using it. I ate beets almost every day when I was on chemo and my blood count never dropped. Of course I was also able to take Neulasta so I'm not sure if it was the beets or the Neulasta.
Prayers sent to you and your friend.