Thai loss of face

My son married a Thai girl and they have a lovely daughter. Last year I stopped her physically by holding her fist from beating her daughter. Relationships ahve deteriorated badly since. Is this because she suffered a huge loss of face?

Does anyone have a similar experience.

...Thai people in general are very different from us...i lived there for 3 years, alot of the guys married or living with Thai women either divorce or lose all their money or both...taking them from the relative poor enviro. they come from and into the west isn't a good idea...most of these girls have little education and they really have a hard time coping with reality, the west and the Farang way of life...good luck and I really feel for you.
feel free to PM me, i'm a gold mine in the subject.