As I do not have a kid, I only have my girlfriend's word to go on for how he/she will be treated when I finally have a child of my own. My girlfriend seems certain that they will face a lot of adversity, and I base a lot of my opinion on her word.
You don't have children of your own and yet based on your GF's opinion you are telling a complete stranger that,
I'm not just warning you, I'm telling you, PLEASE don't move to Taiwan. Taiwan is a country great in small doses, but the children here grow up soulless products of a machine that grinds out spoiled, abused, monsters. Your children will also be subject to intense racism in their early years in Taiwan, as other kids struggle to comprehend why she looks different. She will be called names, she will be treated unfairly by her teachers, she will be hated by her peers.
I am assuming your girlfriend doesn't have any kids of her own either. You can base your opinion on other people's word, but pray do not give advice on it. A lot is lost in translation.