Falkholt, 27, appeared on TV soap Home and Away in 2016, playing the character of Hope Morrison.
She and her sister Annabelle, 21, were seriously injured in the highway crash near Ulladulla, New South Wales.
Home and Away cast members have been sending support to the actress, who appeared in several films and TV shows.
Jackson Heywood, who plays Brody Morgan, posted a picture on Instagram saying: "Much love darlin. Im with ya."
Olivia Deeble, who plays Hope's relative, Raffy, asked fans to send "all your love and healing" to the family.