I'd say go for Poser 6, unless she is using a really old computer that can't run it. Poser 4 is ancient. I suspect CL will shortly not be supporting it any more. It doesn't run on older Mac systems, and isn't tweaked to take advantage of newer Windows systems, either. Poser 5 will probably become Poser Artist soon. If you do decide to stick with Poser Artist or Poser 4, don't pay too much for it. Either wait until "Poser Artist 2" comes out, making Poser Artist cheap as dirt, or buy a used copy.