I think VV learned her lesson well after the first 2 performance, Singapore and Thailand where she went all out and found herself flat out.
She did that as in my opinion it's a singing performance not a variety show as in the case here.
subsequently she mellow down on most of the follow on appearances and the most noticable change was when she sang at the 3 Thai events. Most noticable when she sang Qinghua. She learned how to sing without affecting too much her throat. In Hong Kong it's a different story altogether, staged for singing performance and she went fully focused on singing out her best. Here, it's a variety show not staged for singing and she is also expected to sing songs that she is not familiar with hence need be well balanced in her approach. I believe she managed it very well. "is this a game" was her remark and I believe she know what she is saying. My humble opinion.