Hi,
For the 1st question, no, you don't need to restart Maya, that's the last part of her story (for now), I will continue her story soon
For the 2nd question, in order to save Rayne you need to restart Brooke's story and right at the begining tell her "What's in it for me", after some time she agrees to help you and gives you her direction.
Thank you for playing! :)