After all of these years - I have only had ONE case of vitiligo helped with parasite cleansing. Just one out of hundreds who tried. This person also had thyroid problems.
I do not think the cream will help - you can send it back if you do not want it (although it is a great thing to have on hand for other things).
Vitiligo is a stange problem - as I am sure you and your family quite well know. The cause is not really known but I would say if she also has thyroid problems - she might want to try parasite cleansing - it might help with the vitiligo and it might not - but it would not hurt her to try.