can i bring my nanny to china for 3 months using L type?

hi, i am a filipino and my husband is chinese. we constantly travel to china every 3 months. i want to bring my nanny to take care of my baby. i have few questions.
1. can i bring my nanny with me?
2. what is the easiest way to get a visa for her? i already check the requirements for L type and we already have those.
3. what additional documents we need to get 100% approval?
4. how many number of days should i put int he length of stay to get approve?

i appreciate your prompt reply. thank you!