My only advice would be to start with about 5% of what you'd do to start with on a healthy person - she may be able to tolerate much more, but I know from experience that if too much toxin is dumped into one's blood it's possible to be sick for at least 2 weeks. This is not advised, for obvious reasons!! So err on the side of less-is-more until you figure out what her limits are. I'm sure you already knew this but I'm assuming others will read this and they might not :)

Also, are you going to link this from the ehlersdanlos and ehlers_danlos communities? I'm sure many people would appreciate it.