。
She painted the fence red.
Literal
She [topic-は] that fence [object-を] red painted.
塗る ('to paint, coat, smear') with a color adverb (赤く, 白く, 黒く) is the standard pattern for painting something a certain color. Note that the i-adjective 赤い takes its adverbial form ~く before the verb. 塀 specifically means a fence or low wall around a property — a boundary marker, often made of concrete blocks, wood, or metal in modern Japan. Distinct from 壁 (interior or solid wall) and 垣 (a hedge or natural-material fence).