I'll apologise if I am deemed too young to comment on this.

Sorry that you have to go through this one whole week of ordeal with 4 kids at home. Honestly, the choice of separation should be left to the last.

I might understand (in my context) why she have to be so mean by telling her boss she will work for 6 days straight without your acknowledgement. I doubt she feels good as well.

There's 4 kids in the house to feed, there can be many factor of why both of you are focusing on making money by sacrificing leave, which I may or may not fully understand. She probably has the intention of wanting to make ends meet, you could probably be motivated by the same thoughts as well. Both of you may be hard towards each other, but the intentions of bringing the family up could be the same, why not?

Just remember why both of you are willing to be together and have kids,otherwise, there is no point in marriage if none chooses to express themselves.

Again, I will apologise if I do not understand your current's situation as you would expect us to. I appreciate that you are willing to talk it out with us.

Best of luck