She's poofed into an adult once or twice via magic during the series, but it was a very quick shot of her so I dunno if that's what she would really look like or not. She had a slight redesign in season 3 to reflect her aging, but the most significant was the LNs that take place 4 years after the series. Anime series on left, 1999-2003, LN on right. The LN pic on the right is a fan-color from a sketch in the LN. I prefer her in her anime age because that's what I'm most used to, but it's nice to see that she's growing up to be quite the fine young lady.