Amanda Bernstein is one of Wyatt and Crash's three sisters. She is the oldest one and in the episode Crash Lands she was the one who chose that Wyatt would build a doll as his birthday present (which turned out to be Crash). Amanda is in high school as it is stated in the episode where Crash goes to school. She does not like Crash.
Amanda first appeared in "Crash Lands" for Wyatt Bernstein's 12th birthday party at Build-A-Bestie.