Worried about step granddaughter

My step grandaughter started secondary school a last month. She is a studious child, a bit bookish but confident and loved her junior school. We hear that she now doesn't want to go to school and her mother has kept her at home for a few days. When we asked what the problem was, her mother was very evasive, said she didn't know, the child wouldn't say but reluctantly offered that the school had been advised of the issue - no more information was forthcoming. A few days later we asked how the child was and were told that she had received some healing from a friend and was "feeling lighter". We are worried that there is a problem that isn't being properly addressed. The mother has a history of using quack therapies some of which have done more harm than good in the past. Of course some alternative therapies are useful but any would be unlikely to cure whatever is bothering the child. My step grandson had a terrible skin flare up on his face, his mother took him to her favourite naturopath who gave him cream which made the problem far worse. The skin condition continued to get worse for weeks on end but his mother wouldn't be persuaded try anything else, such is her faith in the naturopath. My step grandson is a young teenager and his looks are important to him as well as the skin being painful.
So I did some investigation and bought some cream for him to use which cleared it up quickly and when it ran out, he asked me directly if he could have some more because he was worried that his mother wouldn't buy it for him. My stepdaughter has lived all her life in a somewhat odd village (which shall remain nameless) well known for the bohemian lifestyles of its inhabitants and their alternative ways of doing things, which she follows. My step daughter had some problems in her teenage years caused by the behaviour of some very unsavoury characters around her. We think she is attempting to give her own children the 'clean' childhood which she lacked and this is her way of doing it. We are worried about the children.