Stephanie,
I know a friend of mine recently served a "banana bread cake". I think she bought it from the Deerfield Bakery. It was quite good.
If you just wanted to have something special for your daughter, you can just make her a "smash cake" of banana bread (perhaps with cream cheese icing). We did that for each of my kids. It was very entertaining to let them smash it, lick it and overall make a mess. Luckily I had my mom and mother in law serving the other cake and ice cream for everyone else, while my husband and I video taped and enjoied watching our kid "have" their first cake. We've watched the video over and over and it's really priceless. So that's my suggestion.