After sharing computer, can't get other account logged out of Inquisition

I let my friend play on my computer while hers was in the shop, and even though she logged out of Origin and I logged into Origin with my own account, when I load DAI it shows all her characters and not mine. It won't let me log her out even though I've reinstalled the game and Origin. Before I delete all her characters off my PC, how can I be sure my next character won't end up on her account?