Do not worry for your small girl, let her grow as she likes. There is no reason for her to like more pink than blue (we created this), more dolls than small cars.

I was like that at her age, I hated girly staff, I was playing only with boys (as I found girls games very stupid :-) and this behavior last for years.

Now I have a huge collection of "girly" shoes (pink but also some blue ones :-) but I kept my love to fix and repair staff (which is a good thing because my husband has 2 left hands:-).

Do not press her (she could react exactly the opposite way you want :-) and just let her choice (dress and trouser, dolls and cars...) so she can experiment. It can be her way to show her difference with her older sister, it can be her way to be like her father...as long as you find that she is happy and behaving good with others kids and you.

If you are are too worry she will feel it so in this case it could be a good idea to bring all your little family to a psychologist just to speak.