During the time of DEMIGODS & SEMIDEVILS, the Shaolin Temple had very strict rules regarding the presence of female visitors on its grounds. Hence, Wong Yu Yin, Ah Chu, and Ah Bik were denied admittance to the temple when they went there with Deun Yu to search for Mo Yung F'uk (and Ah Chu had to subsequently disguise herself as a monk to the enter the temple).
This rule was seemingly waived later on in DGSD, however, because during the Heroes Conference, Wong Yu Yin, Ah Chi, and Yip 2 Leung were all present and the Shaolin authorities did not object.
Several generations later, the 19-year old Gwok Seung visited the Shaolin Temple. She too was initially unwelcome there, but that seemed to be because she was an armed stranger and she had interfered with Gok Yeun the monk's punishment, not because she was female.
By the time of HEAVEN SWORD & DRAGON SABRE, this rule seemed to have been thrown out completely by Shaolin. At the Heroes Conference that ended HSDS, many Ngor Mei Sect members (most of them female), as well as female members of the Kunlun Sect and independent female martial artists, were invited to Shaolin and even rested at the temple's dormitory facilities at night.
It seemed that Shaolin relaxed its policy on female visitors as time went on.