I envy you...mine would take a pasi, but they could not just hang out on the boob enen though they wanted to at that stage. I have oversupply, and if they tried to use me as a pasi they got choked on my milk.
Enjoy this time with her it will pass...
If you really need a break. Try a bunch of different kinds of binkies and you may find one she likes. But, none of them may work.
OH and your MIL is