Honesty sounds the best policy, probaly wise to check if she should mention the part time job she had in HK untill you check the condtions of the visa for a phil in hk.
Remeber us brits might pop over to france or spain as teenagers and work behind a bar with no hassles, but it may not be the same for a phill in Hk im not to sure on the ins and outs im afraid.
Going to hk then on to china and then not be allowed into Hk due to not spending enough time away from HK. Simply touring the countrys.