Is she ready or too childish ?

im 17 and ive been with this girl who is 16 for 7 months im not used to taking a realtionship slow but i respect that she wants to and thats how its been. the realationship has changed alot and her opinion on ualy things has changed. resantly she has told me that she is read for . but im worried that she is just saying this to make me happy and i think she is stil to childish. dus being child like have anything to do with ? i dont want her to regret me if we eva brake up. im worried that shes not ready and that she will regret it. im quit confused atm.can somebody please help me