Adrienne didn't miss seeing Valerie's reaction; she had a gist of what was happening to her friend. She must have started feeling something towards Hunter ever since the incident of her abduction and Airi's death.
However, Adrienne wasn't planning to aid Valerie in pursuing her brother romantically. It would have been better if her friend could see past her admiration for Hunter as her savior to see a man who deserved to be loved for who he truly was. She knew that Valerie's feelings might be clouded by gratitude and the trauma she had experienced, and she wanted her friend to find genuine love and happiness rather than get caught up in a potentially one-sided infatuation.
Valerie rose to her feet and gave Hunter a slight bow, showing her gratitude to him. Hunter saved her life not just once but twice. If Hunter hadn't taken her away, she would have been caught in the explosion and died along with Airi.