Kei my daughter really loves playing car toys . Do I encourage her to play those or I will let her play girl stuff even shes not interested ?

I believe you should allow her to play with whatever interests her. :) Teach her at an early age not to limit herself. This will encourage her to form her own personality and it will inspire her to be whatever she wants to be. Plus: supporting her interests will make her feel how much you love her! :)