It is only fair that her medals be taken from her and that any of her records be stricken, because she was performing under the influence of performance enhancing drugs.
In the arena of athletic endeavor, athletes are supposed to compete without unfair advantage.
If she did and she admits it, then whether or not she knew it at the time is immaterial.
It's heartbreaking, I'm sure, but if competitive sports are to maintain any credibility at all, this is what must be done.
Otherwise, just ditch the rule books and let people do whatever it takes to win.
That's certainly one way to do it, but it's not civilized.