1. She's Australian and she notched a pretty big win against Vekic.Wow, I am deeply impressed. The standards of excellence expected from an Oz player to be worthy of Rod Laver spot in prime time AO have become very clear now.
2. She was facing Angelique Kerber, the 2nd seed, former World No.1, a 3-time slam winner and a former champion.
If she was facing Danielle Collins there would have been no chance in hell that she would have been on Rod Laver. It was Kerber that got her there, not her. Also, the other women's matches that day that weren't on Rod Laver weren't that potentially interesting either. The only match that maybe might have been more interesting for the day for the Australian crowd was Kvitova against Bencic, but Bencic hadn't been playing all that well for about 3 years at that time and had yet to have that Dubai run that cemented her as a great player again.