Great ideas, Lalle. Joni, I have a similar situation as my folks live with us half of the year and my Dad always seemed to be around when I needed to pump (they're gone at the moment). So I bought a free standing three panel screen at Cost Plus Imports for $99 ... that way, I didn't have to get out of my chair or move the pump around and was more likely to get my pumpings in. I just pulled the screen around me. Likewise, I pulled the screen around me if I was using the SNS or Lactaid while nursing as I was a tad shy about constantly flashing my boobies to visitors, plumber, other visiting family .... and could just feed baby or pump according to my schedule ... not anyone elses. Perhaps you already have a screen like this. I also thought of hanging a curtain near my chair, but the screen was easier to put up and no holes to patch on the wall for take down time. I chose a screen that I thought I would use in the house somewhere else later on.
I'll keep your mother-in-law in my thoughts and prayers. Hang in there ... your baby and milk will come.
Aloha,
Christina