I find stories like this really fascinating.

It is interesting to think about their reasons for emigrating. If it was not poverty or persecution, perhaps it was something like a serious professional mistake, career obstacles, a social embarassment or a scandal (if they came from different social backgrounds, then that really could be a possibility...) Or perhaps they just imagine that they'd have more prosperity in the USA (and this seems to have been true).

Exciting to hear that they "lived the American dream".
Emigrating in those days was so dramatic, I mean, travelling by ship for weeks, learning a new language "on the spot" etc. Imagine how she must have fretted the decision to return, then go back again.

I can sort of imagine how your great grandmother felt - torn between two countries, ideals and expectations of how to live. This is going on in my own life at the moment.