This is a link to a burlesque skirt tutorial that would be pretty good as an overskirt. Warning, there is quite a bit of leg showing
Also, the patterns on truly victorian have come highly recommended. I have not personally used them, but have seen the finished results and they are exquisite.
also, bustle skirts look better if you have the support under the skirt - either the little cage, or a tiny pillow on a ribbon. This affects the way the hem of your underskirt lies. I always notice when someone is using a skirt that hasn't been hemmed for a bustle with one. I could just be a costume snob, but that sort of attention to detail adds some extra oomph to a project.
This site is good for inspiration, and the patterns are also free
There are several good articles about how costumes developed during that time period, and accessories, if you care to go into that level of detail.
Good Luck to you and Break a Leg to your daughter!