If my sister is an Australian publicist, can I vouch for her

Yes, relatives of Australian immigrants don't have to be lineal, but cousins can.

Skilled immigrants in Australia refer to immigration applications based on the applicant's age, English, work experience, occupation and other skills, and at the same time, relatives in Australia provide guarantees. Specifically, it can be divided into two categories. The first category is the skilled spontaneous immigrant visa, and the second category is the skilled-regional spontaneous immigrant visa.

In order to obtain many preferential policies for pro-skilled immigrants, the conditions are as follows:

Australia must have relatives.

The meaning of relatives in ordinary pro-skilled immigrants refers to: parents, children, brothers, sisters, uncles, uncles, menstruation, menstruation. Relatives of pro-skilled immigrants in remote areas include parents, children, brothers, sisters, uncles, uncles, menstruation and aunts, as well as grandparents, cousins and aunts.

Your relatives must be Australian citizens or permanent residents.