。
She likes Hiroshima better than any other city.
Literal
She [topic-は] other [genitive-の] which city [more-than-よりも] Hiroshima [subject-が] is-liked.
他のどの+[noun]+よりも is the superlative pattern when comparing one item against all others in a category — '[item] more than any other [category].' どの functions as 'which' (selecting from a set) and joins forces with よりも ('more than') for an exhaustive comparison. 広島 (Hiroshima) is one of Japan's major Honshu cities, internationally known as the site of the 1945 atomic bombing — but in everyday Japanese contexts, it's also famous for its お好み焼き, the Itsukushima Shrine, the Carp baseball team, and as the gateway to Miyajima Island.