Although she had little interaction with Kristoff (including after she struck Anna in the heart with her powers, and at the ending), it is enough to show that although she was scared and wary to see him at first, as she was with pretty much everyone, she ultimately comes to accept him after knowing what he did for her sister. When Kristoff attempted to confront Hans for trying to kill the two sisters, Elsa seems touched by Kristoff's protectiveness over her and Anna. She even gives him the title "Official Arendelle Ice Master and Deliverer", so he can be with Anna.
Also it is shown that Kristoff does care about Elsa to some extent, as he attempted to confront Hans for trying to kill her and Anna. It is worth noting that he was presumably the first person to learn about Elsa's powers aside from her family. In the film's novelization and the coloring book, Kristoff saved Elsa by knocking out Hans.