I think she was expressing her true feelings in a lighthearted way. As if to say "I'm compersionate, help me stay that way while enjoying yourself to the fullest!"

I can completely relate to her remark.

Oh me too, it's exactly the kind of thing I would have said. Like, I'm glad that you've got some fun stuff to look forward to, and I also wish I could get some reassurance that you're not [whatever she's scared of, which is probably not quite what I'm scared of] while I'm away.