>>10560519i'm not so sure to be honest. the only way i could see it being interpreted as "i agree" is if someone made a statement in full.
like if i said "i think that's a very nice girl" then likewise or ditto would definitely mean that you also think she's a very nice girl. however when just saying "[that's] a very nice girl" i'm pretty confident that saying likewise would not mean you agree.
you're a mediocre girl then?