“Suggests”? She’s an accessory to murder by attacking the owner who killed the robber. I read where some guy who drove the get away car at a bank robbery that resulted in the death of either an employee or one of the robbers. He was executed for being an accomplice .
Felony murder. When someone kills in the course of a dangerous crime, the offender and all accomplices can be found guilty of murder. Hawaii, Kentucky, Michigan, and maybe one other state are the only ones in the U.S. that don’t have it.