Thread:Ilovemydog/@comment-26569706-20190722124429/@comment-6268337-20190722131440

In this case, improv is short for improvisation. Used mostly for comedy  (think Whose line is it Anyway?), it just means doing scenes without a script. As an actress, Kayla relies on a script to perform her roles and probably doesn't have time or experience to act unscripted.