[Boy, does she know about being confused about feelings like this. It's been a recurring problem for Elsa for months now. But while she's unsure of how to help herself, she'll do whatever she can to help her sister.]

If whoever this girl is cares as much as a friend should care, then there's no reason to be too nervous, is there? I kn-- [WAIT NO NOT ABOUT HER] I'm sure that it's difficult to muster up the courage to confess such feelings.... but at the very least, you shouldn't be worried about letting them know about this part of yourself.

As a friend, they already love you for who you are. Something like this shouldn't change that.