She didn't see the punch coming because of the blindfold, and her head jostled, but instead of letting go, she hunkered down and pressed her face against his knee to protect it.
While she was sure that if she could stay in this position long enough she could make him tap out, he wasn't going to lay off her her head, which could lead to more problems than it was worth-- like not being able to block because her hands were occupied and she also couldn't see.
So that meant a change in tactics.
Dinah let go of his leg and shoved it down between her own, trying to get her knee to his thigh to pin his leg down as she made an attempt to wrest her ankle from his one hand so she could swing up into a full mount. From there she'd have a tactical advantage, even in spite of his reach and weight advantages.