OP, I will say this. I met a Vietnamese girl some years ago. She was 20 and I was 27. She was very clingy at first, always called me, wanted to video chat, etc. I think some of these women are very desperate to leave and marry to, what they perceive as, someone who is wealthy or offers them more opportunity than they would have back home. You have to be very careful. I would suggest you take a few weeks, go there, meet her, meet her family and friends, and spend time with her. Look for red flags and green flags. You likely won't be able to bring her back without getting married.
But honestly, I wish I had that opportunity again with my Vietnamese lady. Even years later when she got married and moved to Japan, we stayed in touch as friends, she said her partner was aware and didn't mind because we were just friends. She said she really did love me and I think I allowed negative people in my life, who didn't want to see me happy, that talked me out of it. I should not have listened to them. I should have gone there, married her and brought her back to the US.
It sounds like her and her partner are happy, have kids and are enjoying life, at least from what I can see. I'm alone in my house with no one really. I pray to God to give me that opportunity again, wished upon a shooting star also, so who knows, maybe God will lay that opportunity in front of me again. Go for what makes you happy. Sure, listen to people who try to give you advice, but don't let them make the decision for you. Good luck!