My one year old daughter is not teething, she is not hungry, does not have a dirty diaper, we have been playing and everything we can think of... but lately (mainly the past few weeks) she has been constantly crying and whining at times and it is driving me nuts.
I want to help her if somethings wrong, but there isn't. I just want her to be happy.
My oldest daughter never went through this.

Is it a stage of some sort? What are some things I can try to make her happy or to calm her down when she starts this?

Thank you so much in advance.