Did she just eat Reimu?

I think she just feed on her a lil and destroy the shirine and left the rest oof the body on something that looks like a stick

that in the stick maybe are just clothes

we dont see any skin just the ribbon the sleves and the dress (and something that looks like legs lol)

Must be a dream... since that could never really happen (and generally the Youkai can't really quite kill her lest gensokyo falls apart)