Looks like building to me.
Ovy also has a very characteristic posture, especially when at its height, where the snake is keeping the most swollen part of her body straight or nearly so, her tail and lower body curved. The posture of full-blown ovy is very, very distinctive. Also, I've never personally seen an ovulating female roll any part of her body onto its side. (Not saying she won't, only that I've never seen it.)
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