Why Sally Field is so great on "Brothers & Sisters"

I didn't write my thoughts about Sunday's episode of "Brothers & Sisters" yet so want to do that now. The focus was split between Kitty's pregancy and Sarah's custody battle with a little adulterous Tommy and pill-popping Justin peppered in.
But what I kept noticing, and feeling, was the strength Sally Field as Nora brought to the episode. I'm one of six children. There are five Walker children. Moms of broods that big just have a certain way about them and this is why Sally, as Nora, reminds me of my mom.
When Sarah's estranged husband, creepy Joe, comes to pick up the kids after Sarah loses primary custody, Nora shows up - unannounced - for the transfer of the kids. She was just there and didn't have to say much - her face said it all. And when Kitty was getting morning sickness, Nora just knew she was pregnant and even before it was confirmed, had her nose deep in a book of baby names.
Sally's performance is pitch-perfect. It's the best work of her career. It's no wonder she won the Emmy and that Rachel Griffith was nominated. These two women are the cream of the crop in what is an excellent ensemble.
AfterElton.com is doing some terrific recaps of each episode. It's a must-read for any fan.