The info was on a UNSW Med webpage last year, I can't find it anymore so refer you to this thread
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[Undergrad] - UNSW Interstate Second-Round Interview Offers | Med Students Online
"3. Applicants interviewed on January 24, 2012 (ie. interstate) will be subject to exactly the same interview and process as those interviewed early.
4. If the results of their interview, together with their academic and UMAT results, exceed the cutoff that was required for entry into UNSW Medicine in the main round of offers (ie. local), they will be offered a place in the UNSW Medicine course in the late round of offers.
5. It must be stressed that applicants interviewed on January 24, 2012 will not be disadvantaged in any way in this process."
This together with "Applicants are offered interviews on the basis of their combined predicted or actual ATAR and their actual UMAT scores. Interviews are offered to the highest ranking applicants until all interview places have been filled" indicates locals don't get any extra marks.
If your daughter with 99%ile UMAT hasn't got a UNSW interview it's most likely because her school didn't reply to UNSW's request for predicted ATAR, or she didn't submit the required direct application to UNSW. If she did submit one she's still in the running for the 2nd round of offers in January, I suggest you call Mr David Boothey to verify.