I don't think it's a mistake to put your kids first.
It's unfortunately that Si hasn't made the same choice.
She could have.
She has chosen not to.
I have no doubt-none at all whatsoever-that if I told GG tomorrow that I was moving with the kids to Australia (furthest place I could think of off the top of my head from Alaska where we live)-he would scramble and be on the same plane. Even though it would mean leaving behind his parents, siblings, friends, job etc. Because, for 20 years, he has put my kids first over the outside life.
I think it's excellent that your daughter has an opportunity like this.
Having grown up in the slum, not having the opportunity to even go to a decent school in our town, I can greatly appreciate the struggles she will avoid by having gotten a good education from the start.