I was at 30 at the stage, so i will try to deduct the points and try again!What is Kendra#s current relationship points
She should be 20 at the stage you're at. if she's higher then that is more likely the reason
and
Have you done the following
Met with Kendra in the park
Go to Julia's room when she's not there and searched the books
Gone back and met Kendra again in the park and gave her the book
Julia’s book had already given to Kendra, so i guess it may be relationship points issue~