According to www.slang-dictionary.org/Australian-Slang/Smurf Smurf is Australian slang for a short person. If this is where it comes from, it fits for Jackie Weaver (1.5m), not so much for Ellen Barkin.
I am sure someone will have a better answer than this, but as I re all from season one, she got the name from a stepfather/mother’s boyfriend who thought she looked blue and cold after a long day of swimming.
As Artfrog hints Animal Kingdom was an Australian movie staring Jackie Weaver as Smurf, I’ve been watching the series which I really like and just noticed the original movie in the Google Play store.