I work in China, my daughter is currently based in Cambodia.

Elena, you can send her an invitation so that she doesn't need to submit the round-trip tickets and hotel bookings. Besides the invitation, she need to prepare her passport, a copy of the first page of her passport, a filled-out application form attached with a recently passport style photo, and the original and photocopy of her residence permit in Cambodia. After all the documents are ready, she can go to the PRC embassy to submit the application.