This was so cute, sweet.
Arnav called her because he was obviously missing her. Hungey hone ka toh bas bahana tha Arnav ko Khushi se jo batiyaana tha!!!
She knew that he won't bring food/snacks for himself and would get hungry and so she stocked it. Aww.. so cutie pie she is..
His simple "I miss you" in the end was so cute.