Sasui failed to assess properly (the pros and cons of her love for Punhoo) though she was close to him. She betrayed her vanity or self consciousness after knowing and meeting him. (In fact she should have suppressed it and been vigilant in his service.) The Brahmin girl, like an idiot, lost her senses by loving the Baluch. (or) she got fame and publicity due to her association with Punhoo, and that was responsible for her later indiscretion which this Brahmin girl, like a fool, betrayed while the Baluch was with her. (She should not have been much too sure of Punhoo's continued availability with her. On the contrary she should have been on the alert against all worldly eventualities.)
Note: (1) This verse may possibly refer to Satan's presumptuousness demonstrated before Allah.

It was only after it that she learnt what it meant,
The ignorant Brahman' girl lost her existence in that of camel man's.

Sassui could not comphrehend Aari, she was near him,
By getting acquainted with Punhoon, she exposed herself,
The unwary Brahman woman lost her self by being with Baluchs.