While it was true she 'acted' a bit to give Celestia someone to work off of leading up to this audition, Luna couldn't really say she was putting her all into it. Maybe that was because she didn't want to pressure Celestia or give her too much to work against, given her sister's own 'talent'. "I have tried to be the best partner I could be for you. And you have made marvelous strides in your own abilities," it wasn't exactly a lie. Going up one step was definitely not standing on the first floor anymore, "Your Snowfall Frost is spot-on."