The three picked up their chopsticks and started on the food. The scene seemed strangely normal to Naomi. It was as if everything were OK, and her mom were perfectly healthy. In fact, she looked more lively and energetic than Naomi remembered. The whole illness issue seemed like a distant, bad dream. Something that belonged to another reality.
Still, Naomi couldn't take the thought out of her head, so she decided to ask.
If I changed still for yet, would the sentence mean the same thing?