The third point of view:
Isabella was freaking mad, In fact, the anger she was feeling inside was so much she let out an anguished scream; it was so frustrating!
She had fought in public today like one of those shameless women. Why was she behaving this way? It was as if when it comes to issues correlating to Pedro, she loses all common sense - and she hates it. Love wasn't stupidity.
However, today, when she saw that girl touching him, she lost it. But before that fury, she had felt one other emotion; Fear. What if Pedro liked that girl better and goes after her? What If he abandoned her amid his promises and what they've gone through?
Hence, that fear mixed with the anger made her see red at that moment. How dare that girl touch what belongs to her? That had been her thought.