I have the secretlab titan regular size. It’s too big for my wife. She around 160 cm as well. The seat will be too long for her and the support won’t be as good.

I have the ergohuman and it’s good at 1900rm

And recently I bought my wife the sihoo m57 at rm700 plus. This one value for money. Build not as good as ergohuman but the functionality is on par. The lumbar support imo is more solid than ergohuman and way better than the titan. Titan one very little lumbar support.
Can consider this as I think for the value vs price it’s damn good.

I have tested razer iskur in midvalley tmt store and maybe that fits your choice. It’s smaller than titan regular but the lumbar support is way more pronounced in iskur. My wife didn test it though. Best you bring your wife there and both try but from what I tested it’s good.