facebook blocking help?

[anonymous]

for reasons to do with family politics, i have a couple people added on facebook i cant delete. but i did have them blocked from viewing anything until facebook made recent privacy changes. now, due to these changes, those people can see anything any of my friends do on my wall. how can i block her from that, without individually having all my friends block her or removing her altogether. deleting her as a friend isnt really an option unfortunately.

this is the type of stunt from facebook that really make me consider deleting my account...
mostly its just recent activiy left to block her from, any way to do that?