So sorry to hear about your mum Romann .
I think the SE vary according to what chemo you are having . I found some of the anti emetics very sedating and I slept a lot - it wasn't because the chemo was so debilitating it was a SE of one of the other drugs .She may be glad of a quick phone call but not up to talking much .
Main thing is that your mum ,or dad if she's not up to it ,rings hospital if feeling sick ,has sore mouth etc . They have v good drugs to combat SE but will usually start you off on one and if that doesn't provide enough relief need to be prompted to offer you another . I'm afraid he who shouts loudest gets heard ,so time to overcome fears of being a nuisance .
Emend/apprepitant is v good for nausea/sickness . If your mum has history of nausea eg with preganancies/travel sickness she should stress this now .
Difflam is v good for mouth sores . They normally prescribe Vit B to combat nerve pain to feet and hands .
If she's having chemo through a cannula into a vein ( as opposed to a picc line ) it helps if you are well hydrated and have warm arms .
I found I coped well but was surprised how distressed I was by hair loss . If this is a SE for your mum I found the falling out bit hard and was glad when I bit the bullet and had it all buzzed off . I was taken by surprise by how cold it was without hair and if this happens she will need soft caps for bed etc .
If she has morphine for pain it can cause wild dreams .
I found flowers comforting , nice to look at - to counteract the rather over bright institutional hospital visits ,helped blot out the morphine images ( so no flowers with " faces " like orchids ) and just pretty ...
Chin up .
PS I honestly believe it's often worse for relatives than the person undergoing it all . The hospital staff are so kind and you do feel very supported . But the poor old relatives feel helpless and can only worry .