Scroll way down....she is right...
Do not compare the children.
It is a proven fact...
In a controlled environment, observing the difference between little boys and little girls when given a new object....
Statistically, little boys are more likely to experiment with it like a little boy....can I bite it? Change the form? what kind of noise does it make when I bang it on the ground? and for some...how far can I throw it?....and many other more rough observations.
Little Girls want to see how it feels against their cheek, smell it, see if its cuddly, or relate it somehow to a pet or living being.
There are always exceptions...but statistically....you have a normal little girl.
Look at what others suggest...toys that resemble household items....Little tykes or fisher price play kitchen, washer and dryer....she may play with these items while you are playing house for real, mimicking what you do. If you introduce a doll and high chair, she may mimmick your relationship with her and her brother and eventually play house on her own.
Do yourself a favor....get her actions on video. I recently found video of my daughter helping daddy paint her room when she was barely 2. I forgot about her always following daddy and mimicking him....it's cute. You want to capture these things before they get away.
and...
You will love to look back on these habits when you are yelling at her to clean her room when she's 13.
:)