if the fifth house is empty, i.e. has no planets, will that make the woman automatically barren”?
Not at all, but much will depend on “external circumstances”, such as:
– where the ruler of the fifth house is in her natal chart, and what aspects does it make towards the other planets in the chart;
– are there some transits to the fifth house or its ruler that could be favourable,
– synastry, what do planets of her partner do when transposed into her chart,
– the horoscope of the first contact or the marriage itself; sometimes it is possible to define the horoscope of the marriage so that the woman is helped out by the planets in the marriage chart.