Sooooo...our RD getting hugs and kisses... that is positive my friend. I understand you are very skeptical about it, but maybe your W is seeing that her life was better off beside you and that there is not a fantastic life out there.
Things may look easier and different when you get yourself stock feeling depressed, tired, bored inside the R, but once outside, then she may be thinking it was just an illusion and that her family has more value then her freedom.
It seems that she still loves you a lot, that she cares about you and is starting missing you. You are doing great, keeping life together for all 4 amazing kids you have.
Nothing is falling apart and its maybe even better, so wife is seeing it all. She may feel like coming back, but in the same time she may be dealing with a lot of regrets and shame.
It may take some time for her to really commit again to the M, but I think that if you keep the road smooth, that she will eventually move forward to R.
About your kids, exams are a busy time. We just finished the school year here, and it was very stressful with lots of finals. My kids did very well, I am lucky they are good kids. And you lucky too to have some great ones.
Have a nice weekend RD, Lots of hugs to you kiddos and you.