You mother can apply for a L visa to China with the following documents:
1. Applicant's passport with blank pages and at least 6 months validity left before expiration.
2. A truly and completely filled application form affixed with one passport-sized photo.
3. Round-trip air ticket and Hotel reservation.
However, the Chinese embassy in Philippines may have other requiremetns since your mother is 68 years old now. I advise you to enquire about it from the Chinese embassy in advance through the following ways

Tel: 63-2-8482396, 8482395
Fax: 63-2-8482386
Email: mfa.gov.cn|chinaemb_ph