I'd like to see her go down in a rather poetic and tragic way. For example, she follows up a lead on her own late at night, and finds Dooku and Palpatine meeting down in the Courascant Underworld or something. She's shocked to discover that Palpatine is the sith lord they'd been looking for and hastily retreats to inform Anakin and the council. As she's making her way through the underbelly of the city, she realizes she's being stalked by the two Sith lords, they sensed her presence and are going to make sure she doesn't ruin their plans. After a lengthy chase, she makes it to the temple entrance way, thinking she lost them. As she runs toward the temple, Anakin senses she's in danger and quickly heads off to find her.
Just as Ashoka is nearing the temple entrance, Sidious drops in front of her from the shadows and runs her through. He quickly discards his Sith gear and bends over the mortally wounded Ashoka putting on his best concerned face, just as Anakin and a few other Jedi exit the temple. Anakin quickly rushes up and asks the Chancellor what he's doing here and what happened. Palpatine explains that he was on his way to discuss some war stuff with the council when he saw a Sith assassin drop from the shadows and stab Ashoka. Anakin cradles Ashoka in his arms as she desperately tries to get the words that Palpatine was the Sith out, but she's too weak to form the words. The whole while she stares frightfully at Palpatine who is standing behind Anakin, with a comforting hand on his shoulder. He smiles sinisterly at her and she dies. Anakin rages out and wrecks whatever is nearby. Windu is present for this display of passion and anger and it disturbs him greatly, prompting his distrust of Anakin in episode 3. Anakin once again blames himself for a loved ones death, due to his not sensing the danger soon enough or being fast enough to reach her in time, thus bringing him one step closer to wanting the power to save people from death. I imagine this scenario might traumatize the kiddies though. What's everyone think?