@updil99 Hi I can only ans regarding the VIsa log, if you include your child in the applications, therefore she need to undergo medical and payment must be made so that she willl receive same visa you apply.
I think you need to read or include the form 1229 when you log your visa.
this is what written in the form:
Who should use this form?
Where children under 18 years of age intend to travel to Australia,
their non-accompanying parent(s) or person(s) with parental
responsibility (anyone who can lawfully determine where the
child/children is/are to live) may be required to sign a consent
form to give permission for the child/children to be granted an
Australian visa for the purpose of travel to stay temporarily or
permanently in Australia. If one parent, or person(s) with
parental responsibility, has lawfully been made solely responsible
for making decisions as to where the child/children is/are to live,
then only that parent or person needs to sign the consent form.
If in legal you have all documents that your the a person with parental responsibility then i think you can include your child , provide all document like what you have said the annulment letter or decisions letter from court.
You may ask also MARA agent which have some similar case like u.
Cheer Goodluck sa applications,