Cloudedyellow, you sound lovely -- I appreciate it's not always easy to figure out what might be needed or considered helpful, and feeling discouraged.
My exMIL had the same attitude to crying babies, even newborns, as Mummyoftwosoon's did (crying baby = manipulator of mother). I wish she had been more conscious of overstepping the fine and not-so-fine lines that she crossed on many occasions. But my mother knows what the daily chores are in my house and I could never understand why she was so diffident about just picking up where I left off when I headed off to the hospital the times she came over to help when a baby was born. I'm not a bit fussy about stuff like butter, or forcing DCs to drink milk at meals, or dress in colour-coordinated or even season-appropriate separates, nor am I a neat freak.
When my mum came over after DC4 was born she called me in the morning while I was lying in the hospital bed about 5 hours after giving birth to ask what I had planned for dinner for everyone that day, then argued with me that the suggestion I came up with would not all be eaten. I finally persuaded her to cook more than one pound of chicken for two adults and three DCs, then she called again later to ask for cooking directions, where were the onions, how many potatoes, what veg would the DCs eat, what pots to use. It was verging on farcical.
When I got home from the hosp the nest day she held DC4 while I got on with the housekeeping. She was great company though, and very nice to have there, just too timid about mucking in, but the DCs always had a great time with her while I was in the hospital.