。
She put up new curtains today.
Literal
She [topic-は] today new curtains [object-を] attached.
つける covers a remarkably wide swath of 'attach, install, switch on, put on' meanings: テレビをつける (turn on the TV), 香水をつける (put on perfume), カーテンをつける (hang curtains), 名前をつける (give a name). The kanji 付ける handles physical attachment; the same verb in plain kana often slips between 付ける and 着ける. Keep the broad mental gloss 'cause to be on/attached to,' and the specific English equivalent will fall out from context.