Mother and Breast Cancer

My mother has ILC stage 2, 2.5cm tumor, left breast removed. Her/2 +1, ER postive PR neg. Grade 2 Intermediate, no nodes involved. She did A/C 4 treatments. This all started in June 2009 had mast. in july 2009 and started her chemo in aug 2009. No rads.  She had a few scares with feeling lumps by her scar but all turned out to be fine. Now here is my problem. I worry everyday that its going to come back. She has complained for a few months now that she aches so much. She is 76. She had a rash a few weeks ago that climbed up both of her legs to her theighs. She put a medicated ointment on it for a few days and cleared up the worst of it. I think I worry more than she does. I keep it to myself so she dosent get upset. She is going tomorrow for her check up at the onco. I will assume he will schedule her for her chest and bone scan like he always has in the past. She was diagnosed with a arotic aneurysm about 3 months ago in her abdomen at 3mm, so they are just watching it for now. I was told no need to worry about it unless it grows fast. She will have that checked at the same time the other scans are done. My question is what do I need to look for if she isnt feeling good or signs that may need attention. You see she keeps these things from me and I have to be a on guard all the time to see for myself. I see her everyday and she has good days and bad days. To me she is my hero, she went threw all of this and during it all, lost her husband (my stepfather) lost my father a month later and also had to move from her house due to it belonged to his family. All this in a matter of 9 months. I also had my sister come live with me who has mental health disorder, eating disorder and susideal attments during this time. I eventually had to have her go back to where she lived in NE. I couldnt do this all by myself. It was more than I could handle. Any advise would be helpful. I dont want to over react over every little thing and I want to be proactive in her recovery. Thank You again