Define "settle", you make it seem that you are too good for her. Either that is true and you are desperate to settle down, or you think better of yourself than you are.
Could she be trying to get citizenship in your country and she will divorce you later? Maybe.
Could she be after your money? Pre-nups exist for this very uncertainty.
Is she just seeking a better life for herself, that you can provide, and will give you a transactional relationship devoid of any genuine love? Maybe, but that is true of a percentage of women and some marriages start out as a partnership and fade to give and take.
Just keep talking and go visit her and feel things out, and definitely don't cum in her. Keep in mind the cultural differences, if there is no successful son, you are the successful son and will be supporting her parents later in their life in Asia, or they will be living with you in your country.