、。
She's busy preparing dinner right now.
Literal
She [topic-は] now, dinner 's preparation [object-を] do [for-doing-のに] busy.
~のに忙しい ('busy with doing X') uses のに as a nominalizer + dative — '(busy) for/with the purpose of doing.' Don't confuse this のに with the concessive ~のに ('despite'); they're spelled the same but parse differently. Here の nominalizes 夕食の準備をする ('preparing dinner') and に anchors that nominal as the focus of busyness. Verbs of busyness, ability, and purpose commonly take this のに pattern: 読むのに3時間かかる ('takes 3 hours to read').