"MIL considered getting into the pioneer work after retirement.... She did stop talking about pioneering,"
I've known so many that blathered on about how they were going to pioneer after retirement. But when "after retirement" arrived... and armageddon hadn't come... they were all, "huh, what? Oh, I can't pioneer because I have [insert health problem here]." And since she'd never even been a publisher before, she was talking total nonsense. This was probably all at the "encouragement" of the PO's wife that has been counting a 'Bible study' with her for the last 20 years.
And, as mentioned, chances are that after some time with zero results in the d2d ministry, she could start finding other activities that take up her time.
Since your wife wasn't bubbling over with dubthusiasm, I'm thinking there's some other problems in 'spiritual paradise' there. As you mention, I find the lack of "grab the camera and first flight 'cause Momma's gettin' dunked!" type of reaction very odd. Dubs are so devoid of anything to get excited about, they look for any tiny event to be newsworthy.
With your reinstated SIL, I'm wondering a couple of things. I have often found that when reinstated, most come back with enthusiasm, but very few stay excited. The whole "restrictions" process can be very discouraging, so that by the time they have the "privilege" of commenting, they don't really care to. And, depending on congregation attitudes, the reinstated are welcomed back... but then treated like "damaged goods". Maybe something is amiss with sis?
B the X