Awww I'm sorry. :(
Anyway, her name is Mai Valentine. The pun isn't subtle, but nothing about her is, if you've noticed. I have no clue how old she is supposed to be, sorry. She uses Harpy Ladies as her main monster in duels. She pretends to have psychic powers by spraying all her cards with different perfumes so that she knows what she's going to draw, and this plan is foiled by Joey during their duel in Duelist Kingdom. She makes it to the finals there and surrenders to Yugi. In the next arc, Battle City, she also makes it up to the finals (literally, UP to the finals...) but tbh, I'm not gonna tell you too much about what happens there since that's a really good arc and I'd hate to spoil it! :) Though my profile picture is a huge spoiler really, though I think it's from season 4. Not totally sure about that.