is there a difference in use here between só and somente? Would somente be wrong to chose in this case?
Só is a shortened form of somente. Kind of like saying cuz instead of because.
Technically, «somente» is the adverb and «só» is the adjective, but «só» is commonly used as the adverb as well....
I put 'She eats just meat.' and it was marked wrong. Can please anybody explain to me why is that wrong, I'm not a native English speaker.
No, because the adverb is addressing the verb. I think if you wanted it to be "only she", it'd be "so ela come carne"