My Mom Is Currently 68.. And Was Diagnosed With Endometrial

my mom is currently 68.. and was diagnosed with endometrial clear cell cancer april 2014.. she had stroke and lost movement in left arm.. she has tumor in her uterus.. multiple (not of significant size) on her chest.. 5 grape size liaisans on her brain.. has had 20 chemo treatments.. which they recently stopped because she had 2nd mini stroke and lost vision in left eye.. she is now getting radiation for liaisons on brain.. she lost appetite.. doesnt want to drink.. can she take a pre workout deink like cellucor C4 for energy.. and/ multi vitamin.. any ideas for drinks..