They could sorta combine their names (Mike and Marla) and name her Micah or Mika. Micah is a boy's name, but I once knew a girl named that(spelled Mica) and she got a lot of compliments on it. Not totally outlandish, but fairly distinct. Dunno, just popped into my head...

Breanna is a feminine name based on a masculine name (it originated as a form of Brian, according to most sources) so Micah may have kind of the same vibe for her... plus all the Mikayla/Makenna/McKenzie names are pretty hot names for girls right now, so Micah would sort of let her fit in, without having to share her name with a lot of classmates.

Well, I've half talked myself into Micah, lol, you'll have to let me know what she thinks.

Any more tips you can give us on what she might be interested in would help. I love studying name meanings and origins, so I'd be glad to make suggestions. Keep us all posted on if she likes any of our ideas.