I would not give her cash if I were you. Have you seen enough how many BK mums got the helper complain to the labour department that the employer didn't give her ticket? My boss had the same problem, she gave the ticket money to the helper and sign for receipt. Then the helper went to Labour dept. At the end, she still need to buy a ticket to send her back to Philippines!
I always buy her a ticket that add 14 days from her last day with me coz she is entitle 2 weeks to stay either she is finished contract or being terminated.
i.e. if her last day with you 2nd Sept. I will buy her a ticket on 16th Sept.