While Emily Osment was a major part of the show, she did not have a solo song on the "Hannah Montana: The Movie" soundtrack.
The main soundtrack features songs performed by Miley Cyrus (Hannah Montana) and some collaborations with other artists. However, Emily Osment did contribute her voice to the "Hannah Montana: The Movie" soundtrack's instrumental version of "He Could Be the One". This means the song exists on the soundtrack, but it's not a vocal version.
It's great that you're a fan of both Hannah Montana and Emily Osment! You can find more information about the "Hannah Montana: The Movie" soundtrack online.