Is it permissible for us to keep the price of the domestic worker’s travel ticket, which was paid from her wages and then refunded, as compensation for material and moral damages, or must it be sent to her?

Since the company has refunded you the price of the travel ticket, you are obligated to return this amount to the maid. The preponderant opinion is that the wages she received for the period she worked are her rightful due, and you are not entitled to claim any money from her because she left the job.