Hi MAGZ,
I know this is a really late reply (I stumbled upon this thread just now) but I can't help but say something here as I grew up in Moncada, Tarlac and I am familiar with Carthel Science Educational Foundation (located in San Manuel, Tarlac). I am pretty sure this is the location your helper is talking about.
I do not have the exact cost of education at Carthel, but I am pretty sure it is one of the more low-cost colleges around the area. (USD 600/approx. PHP 30k) should be MORE THAN ENOUGH to cover 1 semester of school fees. Of course, that does not include the daily allowance, fare, etc. My cousins studied BS Nursing there and even on their last year with OJT included, each of them did not exceed ($800) in school fees per semester. If the child, however, asks for school fees ranging from PHP 50K and above per semester, then he/she must be wanting to attend an expensive university, or something of that sort.
I suggest that if you are to continue sponsoring the child's education, you should try to get all details, including the cost of study, from the school directly. If they ask for monetary help regarding illnesses/death, ask for a death certificate or a medical certificate, whichever applies. You may also contact the hospitals to confirm if a memeber of her family was really hospitalized. Contact numbers are easy to find on Google as long as you know the name of the hospital.
Also, Moncada is NOT a 1-hour travel from Angeles City. Via a private car, that should take 2.5-3 hours. Carthel is NOT in Manila--it's in a really small town and there are no boarding houses around the immediate vicinity of the school.
I do not know what your helper and her family are up to, but if she could not even tell you simple details such as locations, I am not sure if she is being entirely honest with you. I am not one to judge, but there are just too many fishy details from what I have read, sadly.
Good luck and I commend you for being very kind-hearted employers.