Blast from the Past

Is Samantha who she says she is?
While on tour in Switzerland, Star meets a girl named Samantha. Sam explains that she and Star went to kindergarten together before Sam's family moved away to Europe. Star doesn't really remember Sam, but Sam seems to have lots of fond memories of Star's parents, and that's a topic Star never gets tired of discussing.
Soon Star and Sam are virtually inseperable. But Mike and Mags are suspicious of Star's friend's motives. Is Sam really a blast from Star's past, or is she after something more than memories?