But all the leaves that they eat are really hard to digest, that's why sloths have multi-chambered stomachs filled with bacteria that can break down the cellulose.
Plants are a much trickier food source to digest than meat, largely because of the cellulose in their cell walls, so herbivores have adaptations to deal with this that carnivores don't have.
This was indeed her vice, she spent most of her money on cakes and indigestible dainties, tit-bits of all kinds, which she hastily nibbled in leisure moments.