You need to register an account. Google "Immi account visit Australia" Follow the guidance there. Have evidence to show your relationship is de facto. Letter from employer that she will have a job to return to after her xxx days permitted leave.
If you read the original post carefully, these are NOT orphans. It says fatherless. If a surviving father is named on the Birth certificate his and the mother's agreement will be required.
What seems to be misrepresented is that a third party cannot apply for a visa. ( except in the case of a parent applying for an infant) The visa applicant is the person who requests entry clearance. Sure, a third party can fill forms but it will be signed by the applicant. The document receiving centre ie VFS have no influence on the outcome.
how many shitty accents do the wailing Americans have Clay? Clay.....definition......sticky dirt without substance. Can hold water but not a sensible conversation 😂🤣