Stacking toy

I finally got Becca a traditional stacking toy. You know the one - yellow post, big blue ring, green ring, yellow ring, orange ring, small red ring.

She will not stack with it.

This is what she will do:

1. Bang the rings together
2. Suck on the post/see how far it will go in her mouth
   
3. Chew on the rings
4. Crawl across the floor with rings in her hands
5. Unscrew the post from the base (?!?! I didn't even know it unscrewed until she did it)
   
6. Hit rings when I spin them
7. Turn a fully stacked toy upside down so that all the rings fall off