Unfortunately, however, the rules say that in terms of what goes into her body and registers, or doesn't, on a drugs test, no matter how young she is the buck stops with her.
Remember Ashley Wagner pointing out back when the news first broke that from the age of 13, she was expected to know the rules and to take full responsibility for every single item she ingested and every single form she filled out - not her parents, not her coaches, her - and to understand why? If she was required to accept that level of responsibility according to the rules at 13, Valieva must be expected to do likewise, and to be capable of doing likewise - at 15.