I hate to burst your bubble, but they're all doped. From Rupp to Houlihan to Bekele to Kipyegon. Every one of them cheats. You simply can't compete at the world level without it. This is the reality of the sporting world as a whole, and if you'd prefer not to see it I won't blame you. Just don't pull the lazy-ass racist card when someone points it out.
If '[e]very one of them cheats,' then no-one is cheating. She's the best of the dopers (and, therefore, the de factor best). This assumes that you're more than an armchair 'know it all', and I think this is an assumption too far, even for this thread.
And here we have the Lance Armstrong defence - if everyone's doing it that makes it ok. It's not cheating anymore.