Five Cowgirls were in double figures, led by center Vicky McIntyre, who had 16 points, but that wasn't enough for the home team who led 8-0 and squandered a 42-38 lead at intermission.
The Sooners snagged their first lead since the 3:32 mark of the first half when forward Carlee Roethlisberger nailed a 3-pointer with 17:58 remaining.
That set the pace for a fierce finish.
In fact, neither team led by more than five in the second half, and for majority of the time, it was a one possession game.
The team's were tied late in the half until Ellenberg hit a jumper with just more than five minutes left, and the Sooners led for good from that point on.
But it was certainly a grinder for a Sooner team that now finds itself at 6-1 and just ½ game back from Big 12 leader Texas A&M in the conference standings.