I’ve been there, done that. Bjkmom’s advice is very solid, so I’ll just add to it.
The most debilitating side effect of chemo for most people is extreme fatigue. I used to say that everything felt like an extra level of difficulty. Walking on a flat surface felt like hiking uphill, walking up a flight of stairs felt like running stairs. I went into chemo a runner and by the end couldn’t walk a half mile without resting.
Some people experience nausea, some don’t. I was lucky enough not to have any, but I also had no appetite and lost a ton of weight. Chemo often causes “metal mouth” which makes things taste off. During chemo chocolate, one of my favorite foods, tasted like dirt to me. If she drinks tea a good ginger green tea might be a good gift. Some people get mouth sores so hot spices are generally out.
Most people start losing their hair shortly after round 2 of chemo. Your sister may want to shave her hair in advance or as soon as the shedding starts. Does she have a good electric razor? A trip to the wig store is a good idea because it’s helpful for the consultant to see what her current hairstyle looks like.
If you do buy her a hat remember that a head without hair is substantially smaller than one with hair. My pre-chemo hats were mostly too big to wear once I lost my hair. Fleece hats are great because they’re soft and can hide a bald head.
One of the best things you can do for your friend is just listen and take your cues from her. She’s probably still processing a lot of this, so giving her someone to whom she can talk and who won’t judge her is a great gift.
Chemo messes with your sleep cycles so she may be sleeping in an odd 24-hour schedule. I would sleep for 2 or 3 hours at a time, falling asleep at odd hours, then be unable to sleep more.
I might hold off on the manicure. Chemo patients have to be very, very careful about infection. One cut cuticle probably wouldn’t be a problem, but with all the things she has to watch out for she may not want to risk it. If you’re thinking of helping her out with a trip make sure to check in with her or her husband about the course of treatment. If she’s doing neoadjuvant chemo and still faces surgery you’ll want to factor in recover time. It’s also possible she’ll have to delay one or more of her treatments if she gets ill or her white blood count drops too low.
Definitely offer to take her kids places. I was okay at the beginning of chemo but pretty much useless for anything active by the end. Be someone they can unburden themselves to. They may not want to talk, but knowing you’re there may help.
If she’s married, support her husband. Everyone focusses on the patient but people often forget about the partner and how scary this can be for them. Guys often have a hard time expressing their feelings, but if you ask open ended questions he may open up.
Don’t be afraid to laugh. Black humor got me through some of the worst of chemo.
Does she have an online help page? If not organizing one would be very helpful. The way it works is that you send out invitations to her friends and family to join and they get a link to a calendar on which you enter tasks she could use help with-rides to chemo, meals, dog walking, etc. She won’t have to ask directly and it gives people a way to help without having to be intrusive.
http://lotsahelpinghands.com
I don’t know what kids of chemo your friend is receiving, but here’s a page that might be useful. It’s from a breast cancer site but most of the advice would apply to anyone undergoing chemo regardless of diagnosis. There’s also a lot of good information on the kinds of thing to say and not to say. (Hint: “I’m so sorry you’re going through this”=good. “I know just what you’re feeling. When my SIL was dying of cancer…”=bad.)
https://community.breastcancer.org/forum/69
Feel free to PM me.