@Dani1981 i totally agree with what @Sister has said above. We both attended a BCNA conference in Adelaide a few months ago & this was something we learnt from the medical professionals who spoke. Treatments are now changing & they are opting for the less invasive where possible. It makes sense really, why cut off your leg if youve only have a sore toe!!
Prior to my surgery, one of my local GP's spoke to me about getting a mastectomy over a lumpectomy to reduce the risk & it freaked me out as like your mum, mine was caught early but was aggressive. I was shi......ing myself on my way to my first appointment wondering what decision I would have to make. i was over the moon when my wonderful surgeon straight out said to have a lumpectomy without a doubt. She also took some tissue from below my breast to fill in the gap so you can hardly see anything.
I would say your family are worrying & only want the best outcome to ensure the cancer is gone & doesnt come back, which is fair enough but it is your mum's decision. Write down all your questions for the surgeon to ensure you have all the facts. Your surgeon will have an opinion on their preferred course of action depending on the risk factors involved & the pathology report but your mum has to be comfortable with the surgery option. Good luck & sending you both lots of strength & positive thoughts. Let us know how you get on & what you have chosen to do. You are doing an amazing job for your mum. xx