@PurpleYo
No way would I go near her if I were you.
Someone I know (a young woman - Anna - in her late 20s, ) went on a trip with SIX mates from the same age group, in mid February to the Lake District (she lives in Chester, so it's not just around the corner.) Minus 6 C windchill, and minus 2 degrees C temperature, and 3" of snow on the ground, nowhere open, no shops, cafes, or toilets or ANYthing.
I mean, no normal person would ever do this in mid February NORMALLY, but I guess they just wanted to prove a point; that they will do what the fuck they want and no-one will stop them, just like the foolish, arrogant young arseholes that they are...
Anyway. So a few days after they got back, Anna visited her 68 y.o. nana, and stayed for 3 or 4 hours in her house... Anna is not in nan's support bubble, but heyyyy Anna can do what she wants right? 
A week later, nana was diagnosed with coronavirus, and 2 weeks later, she died from it.
The family is torn apart now, and Anna is being screamed at left, right, and centre. They blame her for nana's death. Her 2 aunts, her mother, her uncle, her cousins... Everyone. Nana has not been out and no-one had been near her since Christmas day, (except to drop off shopping at her door,) and then Anna rocked up to visit her mid February, and gave her coronavirus. And it was definitely her, because 3 of her mates had it at the same time as her nan. Cue, a family destroyed.
So yeah, I would not visit your nana for a split second. Don't want the same thing happening do you?! You may not have coronavirus, but you may be a carrier!
I also agree that it's despicable to lie about having the vaccine (if you haven't had it!) The poster claiming this sounds like the same kind of selfish, entitled little madam as 'Anna.' Anna is getting her just rewards now, hopefully that poster (and covid deniers like her) will get hers too (and soon...)
disclaimer...
Anna is not her real name...