How do I add bones to a previously made rig and mesh so that I can animate a 3d model's hair?

I made a character and it has been rigged. Her hair doesn’t move so I tried adding bones to it and parenting it in edit mode to both the main head bone and creating a new vertex group for the hair mesh. I am trying to animate the character’s hair when she walks. However, nothing I’ve tried so far has worked. Any ideas? Also if by some miracle I get this to work, must I animate the hair for each one of my animations? I also tried to model and animate the hair using two hair particle systems. Here is reference link: https://youtu.be/FuCv4DLVLpw