I might be wrong, but I think that Annaʼs complaining about not packing properly for her holiday is (at least) partly a poor imitation of the self deprecating irony usually encountered in British people and their humor. But what I love about British humour is its wit that Anna certainly doesn't understand and hasn't absorbed even after spending years of her life there.
Sheʼs always making these petty remarks as if to draw attention upon how 'interesting' her person is. Her audience is already tired of her posts so she thinks that relating all sorts of incidents is going to spice things up when it fact she becomes creepier as time goes by. Her 'friends' are people we barely see in her posts or stories (some of them in fact we have never even seen before in spite of her claiming to be the best friend of everyone), her social life seems to take shape once a year only to be forgotten for the rest of the time because Anna is always working although nobody knows what she is actually doing.
I do not wish to judge people who are lonely because it is something hard to bear, but what she does looks like having a personality disorder. She reminds me of the stories of lonely housewives desperately trying to hold a family together while faking smiles. We no longer live in those times and if those women were pushed by the societyʼs standards in that lifestyle, Anna is harming herself by creating this happy, 'affluent' fake persona to compensate for her failures. The price she pays for being inauthentic and dishonest is too expensive if you ask me, but at least the people actively writing and reading these threads get the chance to learn from her mistakes.