Well obviously Davis, the rider of Mrs Frankel disagreed because he lodged an objection. And the chart callers really didn't seem to agree either - I have appended the relevant chart notes below. Not sure how the stewards can make the judgment that the incident did not cost the horse a better placing. Once Lovestruck came out and knocked into Mrs Frankel, she seemed to lose any interest, but it is not like she was backing up at the time. She stopped after she got hit and still was a little over 2 lengths off the bottom slot in the trifecta at the wire. How can you say that the bump cost her less than two lengths? To some extent, I would be fine with this type of decision if it was consistently made, but it seems arbitrarily enforced. I think in many ways if they broadcasted EVERYTHING that went into the steward's decision live it would help with transparency, but I suspect that those of use still regularly handicapping would likely quit after the first exchange - but I gigress. I think it was a bad call and was surprised she did not come down, especially given some of the other horses they have DQ’d during the meet.

From DRF Chart:
“LOVESTRUCK… was aggressively maneuvered farther to the outside deep into the furlong grounds, on a mission to attain path four and better racing room, made hard contact with MRS FRANKEL, herself coming in with the rider applying some stick work from the right side, muscled her way into the coveted path at the expense of the aforementioned rival…”

MRSFRANKEL (IRE) made it into the pocket nearing the end of the homestretch, eyed the front runners within striking distance, went approximately four wide into the lane, began to shift into a tighter fit along its path when fed some right side pressure in the furlong grounds just as the top one was herself getting steered towards her, lost any remaining interest after bumping soundly with that opponent in the vicinity of the eighth pole.