At 14 you believe whatever your parents teach you.....
She probably doesn't have a full grasp of all the interpretations either.....
She has been brought up believing that in 1919 Jesus appointed the WTS as the Faithful and Discreet Slave, caretaker of all Jesus' earthly belongings. In order for her to survive Armageddon she must obey all the dictates of the WTS.....that in short order is her only knowledge.
She is still a child and obediance is a major aspect of her life with or without the WTS.
Gently tell her that when she turns 18 she should really 'research' her religion as suggested in "What Does the Bible Really Teach".....that 63% of those born or raised JW remain JW, the rest leave and join forums like ours!