Cruel Country — Marion Lennox

Traffic accidents had a special meaning for Dr. Claire Bannon, and she was brusque with the care driver when a child was accidentally knocked down. The driver later revealed himself as Dr. Alistair Drummond, who persuaded Claire to leave London and work with him at his Outback hospital in Australia.
But it rapidly became clear that Alistair's widowed mother needed Claire's help, which alienated Alistair and Nursing Sister Rowena MacMillan whose interference had caused Mrs. Drummond's unhappiness had no hesitation in declaring Alistair her property. How could Claire make Alistair see the truth?