Hi. Good to hear that your mom is doing well thus far. Sounds like she is keeping a positive attitude and that speaks and does volumes. Keep encouraging her.
I work at a cancer office and my sister is also on Epi and Cisplat. What usually happens (now remember everyone is different) is that about 5-7 days after the chemo is when counts start to drop (red blood cell and white blood cell). That is when she may be very fatigued and not feeling well. Her doctor has probably and will probaby give her some shots to help boost her counts. Also, with the Cisplat it is important that her kidneys flush the drug out so she needs to stay hydrated and drink plenty. They probably gave her pre and post hydration with her treatment which helps also. Cisplat can be hard on the kidneys. My sister is now 7 days out from her treatment and is currently experiencing this. Her hemoglobin went from 10.9 one day down to 7.6 the next so she has gotten 3 units of blood over the last 2 days.
Make sure she gets rests and doesn't overdo things and that she drinks plenty. I know what you mean about the calories. My sis is not eating much at all and has dropped so much weight. We can't get her to eat anything really... a bite here or there. Even shakes and protein drinks don't appeal to her much.
Hang in there.
Tracy