MasterClass60 asked about this song from Equestria Girls, so enjoy your request! I thought it would be fun if, as she watches Sofia leave her island following their adventure in Ivy's True Colors, she sings this to herself as she thinks about her past actions, then realizes that she really had a kingdom of her own all along. She also realizes that she has animal friends, and a fairy friend in Miss Nettle, to share it with her. Equestria Girls is not mine.

Princess Ivy: Power
Was all I desired
But all that grew inside me
Was the darkness I acquired
When I began to fall
And lost the path ahead
Thats when your friendship found me
And it lifted me instead

(when she was trying to take over Enchancia in The Curse of Princess Ivy) Like a phoenix burning bright in the sky
I'll show there's another side to me
You can't deny
I may not know what the future holds
But hear me when I say
That my past does not define me
Cause my past is not today

(when she tried to keep her butterflies to herself in Ivy's True Colors) Ambition
Is what I believed
Would be the only way to set me free
But when it disappeared
And I found myself alone
That's when you came and got me
And felt like i was home

(when she sees the error of her ways and learns that she has a kingdom of her own) Like a phoenix burning bright
In the sky
I'll show there's another side to me
You can't deny
I may not know what the future holds
But hear me when I say
That my past does not define me
Cause my past is not
TODAY