"She likes wearing clogs more" isn't inherently odd, but it does imply a comparative in the surrounding context (i.e. "she likes wearing clogs more than something else). But that's to be expected in the Comparative and Superlative skill. :)
When using preferably in the middle of the sentence, the adverb is placed between the subject and verb (i.e. "She preferably wears clogs"). It could also go at the beginning ("Preferably she wears clogs") or end ("She wears clogs preferably"). Here's some more information on adverb placement: http://dictionary.cambridge.org/us/grammar/british-grammar/adverbs-and-adverb-phrases-position
FYI - "She prefers to wear clogs" was accepted. (Oct. 2014)
Hi Stephen. In Dutch you'd better say "Ze houdt van klompen dragen". If you want to put "te" in it, there is a way "Ze houdt ERvan klompen TE dragen", but it sounds maybe a little sofisticated. The main problem at the other hand is, that " Ze houdt van klompen dragen" has a different translation, meaning in English "She likes wearing clogs" and not "She likes wearing clogs MORE", which is the required one. Wish you a nice fall, Lu.