I've not heard of Iscador before, but here's a site with study results. This site refers to it as a complementary treatment, not an alternative treatment. If you do a google search for "Iscador" you'll come up with a ton of info. I'll be going back to read them myself:
http://articles.weleda.com/List.asp?...ordsPerPage=25
My experience, in general, is that there is a wide variety of "natural" treatments that work really well, when used appropriately and in tandem with conventional medications, especially for serious medical conditions. I used them alongside conventional treatment for my dog's intestinal disease and they improved her condition considerably.
Your girl sounds like she is still enjoying life - that is the stick that is most important for measuring quality of life. As long as she is truly happy, enjoy every minute.
