Sorry to hear what your mum is going through right now with the swelling and the chemo brain. As far as her swelling goes, it could well be that she has ascites which is a build up of fluids. Here is a link that may be of use to you -
http://www.macmillan.org.uk/Cancerinfor … cites.aspx
Have you spoken with your mums doctors about this? If not then perhaps you should as there are things that can be done for this. Unfortunately, ascites is one of the symptoms of this cancer and it is quite common, and my dad went through it as well. Are your mums legs and her abdomen swollen as well? I know that there are a ton of posts on the site about ascites and using the serach forum function will throw up these discussions. I hope that you can get some help for your mum with this.
Any advice or comments I give are based on personal experiences and knowledge and are my opinions only, they are not to be substituted for professional medical advice. Please seek professional advice from a qualified doctor or medical professional.