I'm so sorry to hear about your brother, I truly am.
I am not an unkind person but, in all honesty, I don't think her mother's death impacted her life in the same way. Firstly, my friend was nearly 70 when her 92 year old mother died. That's not a bad innings in anyone's book.
Secondly, she still had her fit, healthy and loving husband whom she'd been married to for 50 years to comfort and support her. The very person whose shoulder you most want to weep on was there with her, to help make funeral arrangements, to sort out the paperwork and, most importantly, to offer love.
She didn't have to come home to a silent empty house, knowing it would remain that way. She didn't go to bed on the night of her mother's death alone gazing in numbed disbelief at the cold, vacant space beside her or get up the following morning again to silence, with no-one to hold and comfort her.
Nor did she didn't have to worry herself sick about finances because she'd lost her husband and therefore part of a joint income. She didn't have to rethink and restructure her entire life either.
There is also the vast difference in ages. Her mother had lived 45 years longer than my husband. She was over twice his age when she died. She also died peacefully in a nursing home while my husband died quite suddenly, out of the blue of a massive brain haemorraghe which caused blood to poor from his mouth and eyes as he stood before me. He hadn't been ill at all, there were no underlying health issues and it was just a normal, average Friday morning.
You can't empathise back when the goal posts are so wildly different. You really, really can't.
Besides, I personally would not consider her approach remotely empathetic. She said 5 token words about my bereavement and then proceeded to talk for 40 odd minutes about her mother whilst her husband hugged her lovingly and I stood there alone. I have absolutely no qualms about her sharing her loss and I was sorry to hear about her Mum, but I wouldn't dream of being so insensitive and self absorbed in those circumstances.