You should call her before visiting.
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means visit so the verb vocab version is to visit.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: You want to visit your friend Taz (たず) the Tasmanian Devil. He's your best bro, so imagine visiting him and having a good time and saying you're going to visit him again.