Enne: With that outburst from your MIL, I think she's not coping well anymore. She needs help and so do you. Do talk to us here to let out your steam.
Hey, for the 3 options given to you, here's my take.
1) Send big L to CC - Very soon, big L will be going to kindergarten anyway. But will your MIL feel that you're "taking" big L away by doing so?
2) Get a maid - This will definitely alleviate your MIL's burden to have to take care of the children and do housework. She will definitely be more senang while big L is still at home with her. She can jagar the maid as the maid takes care of big L, and she can focus on caring for little L. You can both also train the maid up to care for little L.
3) You quit and stay at home.
Options #1 and #2 will incur extra cost, while #3 will mean lesser household income.
Between #1 and #2, you can weigh which is more costly. They may end up about the same with the rebates given to working mums..
After you've discussed with hubby, then get your hubby to "talk" to your MIL. This will soften the impact for her.