Dispute over fitness to return to work
A. Unless there’s a clear term in the contract allowing the employer to withhold payment while they seek their own medical advice,they should continue to pay her. This was confirmed by the Employment Appeal Tribunal in Beveridge v KLM UK Ltd [2000] IRLR 765, in a case brought by a member of cabin crew when her employer stopped paying her in similar circumstances.
If there’s no explicit contractual term and your member’s employer does stop paying her, she can bring a claim for unauthorised deduction of wages.