My mother in law is a China passport holder, can she used multiple entry visa to Philippines?

She is a mainland China passport holder. She is planning to have a multiple entry to the Philippines. She's going to the Philippines from Xiamen on April 10, then on July 1 she's going to Macau from Philippines. And on July 3 can she go back to the Philippines from Macau using the multiple entry ? Or she has to go back to Xiamen then fly to the Philippines?