So having been an official scorer in the past, this intrigued me, so I did a little research and came up with the following.
The NCAA's "Official Basketball Statistics Rules," see
http://fs.ncaa.org/Docs/stats/Stats_Manuals/Basketball/2008 Bsk Stats Manual easy print.pdf, says, in Section 3 -- Rebounds:
Article 1. . . .
(a) An individual rebound (player rebound) is credited to a player who recovers a live ball that has missed scoring a goal (field goal or free throw). The recovery may be accomplished:
(1) By gaining control of the ball.
(3) By tipping or batting the ball to a teammate so that the teammate or another teammate is the first to gain control. (NB NCAA rules define "control" as holding a live ball or dribbling a live ball while inbounds.)
Philosophy. A player should be credited with a rebound only if the player earned that rebound before the ball was dead.
Article 2: Sometimes there is doubt about whether a player has gained control of the ball before a certain act takes place. In such cases, the statistician should use the following guidelines
(a) If the statistician feels there was a possibility of player control, then the play shall be treated as though there was player control.
(b) If the statistician feels there definitely was not a possibility of player control, then it shall be treated as though there was no player control.
So based on this, the official scorer & statistician could very reasonably have concluded:
1. The Ohio State player never had control of the ball while inbounds.
2. The first person to have control inbounds was Ms. Ekmark.
Therefore, she gets a defensive rebound and a putback.
The key in this is control. This, by the way, is why a player who is falling out of bounds with the ball can no longer call time out while doing so, since she is considered not to be in control of the ball while inbounds. (This recent rule change, I thought, made perfect sense.) If you think about the purpose of that rule change, it is consistent -- a team can only call time out while in control of the ball; a person falling out of bounds is not in control of the ball; thus the first person who WAS in control of the ball was Courtney Ekmark, since scoring a basket implies that she had control of the ball, if only for a split second before shooting it. Therefore, as the first player who was in control of the ball following the missed shot, she is the rebounder of that missed shot.
Hope this helps shed light on an admittedly unusual situation.