One of the best ways to send energy to someone you love is to spend a few minutes each day thinking about that person, sending them all the love, protection, healing, strength, and courage energy you can.
You could also make her a little bag for her to carry with her during the treatments. Here are some suggestions:
Bag: blue, green, tan, white, or in her favorite color
Herbs: chamomile, lavender, sage, marigold, St. Johns Wort, echinacea
Gemstones: bloodstone, amethyst, tiger's eye, blue lace agate
I will keep your best friend in my thoughts.