It is better to turn her in and let the authority deal with her.
The phrase "turn somebody in" means-

• The phrase "turn somebody in" means- ক) To hand a person over to the police.

• Turn somebody in
- English Meaning: to hand a person over to the police or authorities.
- Bangla Meaning: পুলিশ বা কর্তৃপক্ষের হাতে সোপর্দ করা।

• Ex. Sentences:
- She threatened to turn him in to the police.
- The hit-and-run driver turned himself in to the police the day after the accident.

Other Options:
খ) To severely punish someone for a crime - কাউকে অপরাধের জন্য কঠোর শাস্তি দেওয়া।

গ) A bureaucratic process - আমলাতান্ত্রিক প্রক্রিয়া।

ঘ) To give someone advice - কাউকে উপদেশ দেওয়া।

Source: Merriam-Webster Dictionary, Accessible Dictionary, Cambridge Dictionary.