The woman is clearly so self obsessed that she’s become deluded beyond any reasonable means. As other posters have pointed out, I also believe she suffers from narcissistic personality disorder. She completely and utterly believes in all her phobias and the number of these is increasing exponentially the longer she’s in the show. However, she’s clearly not particularly bright because she’s contradicted herself on one too many occasions: as OP remarked, how come she’s never had her head under water until the other day and yet she almost drowned once?
And besides, how can someone be scared of touching a half dead worm, yet be more than willing to stick their head in a bowl of poo??