Apples, Alligators, and Aardvarks

Sophie and I have been reading the creation story and working on the letter A and the number 1.  

She loves the creation story and giggles when we talk about Adam's job {to name all the animals} because he picked some silly names. {aardvark and crocodile seem to really make her laugh!}

 We colored with white crayons on white paper and then painted over it with black paint to make the white lines show up - we had a blast with that!  We've also painted the letter A red {like apples} and worked with cutting and pasting.

Today we are making an alligator  out of an A - complete with google eyes :)  Can't wait to see her giggle about those!!

Now, I have a question for YOU:

Sophie has colored, drawn, painted, and eaten with her left hand for over a year.  This week, when we started working on letter writing - she's trying to use her right hand....and now she's not holding crayons or paintbrushes correctly??!

Do I push her to use her left hand, or wait and see what she does?  I don't want it to become an issue, and I'm a little confused as to the switch?  Any thoughts?