but also - aren't most christmas card for charities anyway? ok now I"m just being petty.... but I agree, it may have been to reassure folks that there is no card in the post for no other reason thanI suppose s/he might bei thinking that if people were wondering if they'd done something to offend her, that might provide reassurance? But yes the smug charity reference is unnecessary.
ETA I haven't sent any cards to anyone (other than a couple neighbours) for about 10 years now. Simply couldn't keep up with addresses etc and working full time and and and. and I'm probably a terrible, and definitely a pinch of laziness in there too. mea culpa!!