Just had a look at her insta as im fairly good at eyeballing bra sizes and i reckon she's probably in the wrong bra size us goes braless a fair bit - she's taking size 12 in most of her stuff atm and she's not got a wide ribcage... at an absolute shot in the dark i'd say she's a 34D or maybe even a 32DD. She's definitely wearing too big a band size - the majority of the support should be coming from the band not the straps.