Welcome fellow nuck hehe, and glad your getting hit with the fish bug, and stumbled onto this site, I only recently found it as well, buts its bar none the friendliest fish site I have come across.
COBettaCouples cleaning crew suggestions are both great choices. I find corries are a bit less of a cleaner per say, but they are fun little fish. My wife refers to them as little puppy dogs from there mannerism. Another good choice in a small tank and are excellent cleaners are shrimp. Amano (japonica/algae) shrimp are great little cleaners, and fun to watch in the tank, they won't breed in a fresh water tank like cherries etc, but they are hardy and get a big bigger and don't get eaten up by gouramis etc.
My four year old is obsessed with my shrimp, he doesn't have any in his tank yet, as he is still learning how to take care of his tank, I will start helping him with plants once he has basic care down, I dropped a couple hardy plants in but mainly I let him do his decorating. He is more at the stage of wanting bubbles and pirate ships in his tank atm anyway hehe.
I strongly believe shrimp need plants to hide and feed on, but they are very fun and beneficial addition to a tank.
Hope you and your daughter enjoy your fish
