I'm all for stripping positive testers of anything you could strip them of. But Liza has not tested positive. Nor is there anything unusual about her performances.
She's actually the last athlete that Lydiard coached to an Olympic berth. Arthur always believed that you could run a marathon every two or three months. He also used to have his athletes do one as a time trial a month or so before your "big one" and had his athletes use races to sharpen.
As Orville points out, in decades past, it was not at all uncommon to run several marathons in a fairly short span of time. Jack Foster did seven one year, as I recall. Rodgers had years when he might run five.
Yes, there are cheaters in the sport. But just because someone does something you can't do doesn't mean they are using drugs and it's sad that someone who accomplishes something very admirable yet also very attainable has to ddeal with this sort of crap.