I dare say they will ask her to publish some of the relevant bits of the legal advice.
As far as I can see she (and ex-husband?) sold their home to a trust for her disabled child.
Following the sale she was advised that the standard rate of SD was payable on her next purchase.
Subsequently advised that this was incorrect.
Without seeing the initial instructions, the original advice and the follow up advice its difficult to comment much more it - not that that will stop anyone.
Do as Jeremy Hunt did - correct matters by paying the additional tax owed.