Dear Ankita,
Do you have evidence of allotment of the laptop to the employee? Have you designed Asset Allocation Form (AAF)? If yes, then have you recorded on this form the details of transaction between your company and the employee? If yes, then send a notice to her. If she does not respond, then send lawyer's notice. If she does not respond even to that also then lodge a police complaint. While lodging police complaint, provide details of the employee like her employee No, Aadhar card No etc to the police authorities.
If you do not have evidence of asset allocation to the employee then your case becomes weak and retrieval of the laptop from the absconding employee could pose a challenge. Nevertheless, taking lesson from the episode, start maintaining the records of allotment of company property to the employee(s).
Thanks,
Dinesh Divekar