Does it matter - I don't watch East Enders either but she's been in it from the beginning!
That was me attempting to be snarky, after you said
"Never heard of her and she was 82 - one has to 'go' sometime" when I posted that Florence Henderson, a well known movie actress and who played the mother in "The Brady Bunch", had passed away. I felt your response was a bit harsh and abrupt when someone had just died.
Even though I genuinely don't know who Dot is, of course I wish her a happy birthday, and I would never have posted something similar if she had passed way. Sometimes it would nice if we all moderated our responses to things other people post, and not make abrupt and inappropriate posts just because we can.