The Vietnamese family will support their child's family anyway they can and make sure you have a good wedding, so if they need help and you can do it, it is a normal thing to help. They will always say the truth, please don't doubt her. You don't need to snoop around her phone or what she is doing.
Nobody will judge you on not helping, but your wife will sure stand by her family when they need her. She knows she is married and will not want to do anything that will hurt your feelings. She will definitely comply Hey, chill out, Vietnamese girls are not robot.
Vietnamese girls are not gold-diggers, but if you show a low-class lady a pile of gold, she will dig it... I have heard a lot of foreigners in bar talking about marrying a Vietnamese girl requires you to marry the family, This is not true at least from my experience.
If you want to help, that is great, she will not make it a priority or makes you feel you should do that.
I will be sharing some man to man talks with you and also debunk some rumour you have heard or something someone had when dating a Vietnamese lady.A lot of working class ladies just want someone who is cool, nice and you should be an independent guy.Some men out there will tell you that the girls need your money and you must be careful.I am not saying that all the ladies are 100% loyal, but when you are good, you meet good people, at least i have met more than 95% loyal ladies.
If you continue this post, i will tell you why you keep meeting the wrong ones too.Don't insult the family value of a the Vietnamese lady.