She liked playing basketball, posting Instagram photos and going to music festivals.

But Sydney woman Kalynda Davis, 22, is now facing possible death by firing squad in China after being caught allegedly smuggling 75 kilograms of the drug "ice" out of the country.

Kalynda Davis is in custody in China for allegedly trying to smuggle ice to Australia.

Consular staff and the family of the young Penrith woman closed ranks on Friday in the hope of minimising publicity on the case.

A family member reported Ms Davis missing from their two-storey Glenmore Park home on November 5, only to find out several days later that she was in custody in China.