Burju is a fantastic dance shoe company that makes shoes in 12 US, but I would recommend doing their foot measurement process (they have a video on their website!) A little $$ but very worth it. Their brand ambassadors for heels are different genders, so I think this could work!
I did some poking around online and it looks like dancewearcorner.com has some character heels that might work! It looks like Amazon has a few size 12 options for Latin shoes as well.
I googled size 12 dance heels and it came up with a few Amazon links. Not all styles are available in 12s, but there are a few to choose from and for a pretty good price! I get all my dance heels on Amazon and have had good luck with quality and fit. I hope she finds some! There’s something very cool about your first pair of dance heels.