She was rather large in the past, but in her recent videos there's no way she's an F cup.
It's tough to tell, honestly. She kinda slouches in her vids. I know she's lost like 30lbs recently, so she may have shrunk down
She did a bra fitting video (unfortunately never took her top off), but the bra she was demonstrating with was A) huge, and B)non-padded
Also she mentioned she can't buy bras at Victorias Secret and other mainstream stores. I know VS doesn't go up beyond a DD/E, so next one up is F