ok, i am a hairdresser and i have to say i have seen sooo many bad home haircuts, where the mums have to bring the kids in to get it fixed up after they have made an absolute mess of it! and sometimes there is no fixing a bad haircut! lol!
please take your DD to a salon i had a look at your pics and imo i would just get all the ends trimed so it looks thicker all over and dont get a fringe so you can still tie all her hair up. fringes look good but can be high maintnance as they grow out quickly and end up in eyes, so not a good idea if you dont plan on getting her haircut regularly.
i am sure the hairdresser will give you suggestions. but make sure your clear if you dont want it to be too short.
i hope that helps, remember haircuts should be fun!