Hi Sarah,
Happy to help anyway I can. Yes I waited until I finished chemo ( AC and taxol) as you need to process things. Had about 4wks break before I commenced radio. Needed to heal from chemo. I found it helpful that I got a second opinion. Both doctors explained their views and even my surgeon. What ever decision your mum makes will be ok. I did have a sore arm. Still do from time to time. I needed to drain the armpit after the tubes came out a couple of times.. I also had slight cording which my physiotherapist helped with. Recommend getting a physiotherapist to keep your mums arm in check. The thought of Lymphadema scares the life out of me so I'm doing all I can to be informed. Went to Lymphadema work shops to be across it and aware of the risk factors..good luck with everything if you have any questions at all ask away. Take care, Donna