1) She has trained high volume for the triathlon for a long time now. That 2:41 debut was with a lot more base than most marathon debuts.
2) Just because you win the triathlon, doesn't mean you are remotely nearly talented enough to succeed at running. Its pretty well known that the tri is significantly less competitive than running, let alone marathon running.
3) Shes tall - 5 ft 10. This helped her for the triathlon but its going to hurt a lot for marathons.
4) Shes been a runner before and was not that good. Her 10k PR may be blazing fast for the triathlon world, but its 5:25 mile pace. Jordan Hasay runs 5:23 pace for the MARATHON, not a track 10k. She may have improved a bit since then, but shes still worlds away.
I imagine this is also a terrible financial decision.