Regardless of her protestations of innocence, Houlihan did her time and served her penalty and forfeited two Olympic shots. Whatever career she was going to have is off the table, forever — the cost was total — and she's welcome to attempt a comeback. Hope she's ready for the potential crowd reactions at Hayward every time she steps out there.
If she ever admits guilt, she will be liable for fraud, because she fundraised off those protestations of innocence. The fundraising was probably dumb, because if she just said, "Yeah, we all pushed the limits with our supplements, and I got sloppy with the timing, lesson learned," she would have earned back some goodwill. If she tries that now, she gets sued, or worse.
I have more of an issue with the way she played in the grey margins during her suspension, what with coincidentally being "in the neighborhood" right around the same time as certain BTC workouts. Remember the athlete(s) who quit over that and made their concerns public.