Can you take a picture of Minnie Mouse, delete Minnie's face & put your dd's face in it instead.
And then just title it:
'Maisie Mouse is turning 3'
I am clueless right now so I can't think of any cute jingles. Did you do a search for Minnie Mouse invitations? I do that sometimes but change the words around but it gives me some ideas.
Like my son just had his party at the bowling alley. I had a picture of him from Yankee Candle on a chair with a crown nearby (looked like a King's chair). So I deleted the background of that picture & just had him & the chair.
Then I added-Please join the King Pin for some strikes & some spares and of course with some of his favorite friends.
Good Luck