With the tarot, Yona uses the celtic cross spread, and she'll lay them out one after another. She'll shuffle the deck between the spreads, to see if the same cards come up again, which she takes as a confirmation of what she said prior. It's possible that a specific ard just won't come up for you in a reading. Some readers, especially those who don't like to deliver bad news, will remove certain cards from the deck.
If you get a grand tableau reading from her, that uses the 36 card lenormand, and it does use all the cards at once. The tower has a completely different meaning in the lenormand than it does in the tarot.