At first I thought it was really strange, but then it made sense.
She's not a real person. She's a virtual idol. Her real identity is Lalisæ. YG created her & her whole backstory.
She had to attend all these events virtually, she's the most mysterious from the beginning, least accessible out of all the Pinks, her Instagram are all #ad, post almost nothing of her personal life. We have zero idea who she's friends with.
It takes a lot more resources to deploy her than the other girls because they need to employ animators, 3D modelers, voice actors and artists, so that's why she can't attend as many events are the other girls. That's also the reason she keeps getting the same clothes, hair and backdrops in appearances, because they're too lazy to create new assets all the time. She didn't get sent to music show because it wasn't worth it to create live renderings just for her solo performances. They made her a foreigner so that they can justify when her spoken voice sounded unnatural or rendered. They made her Thai because it's cheaper to hire Thai actors to pretend to be her family back home than to hire Korean actors. It's also the reason she can't appear with other celebrities when attending events in Thailand for her endorsements & have to have a separate show just for her.
This might seem like a closely guarded secret, but some in the K-Pop industry actually knew about this, such as SM. That's why after seeing the success of a virtual idol Lalisæ they decided to make her into their entire group concept. That's why æ-Ningning looks so much like Lisa. She's their prototype.