Grain Free Kitten Food She Can Eat

Hello everyone!  I am new to the forum and have a question about grain-free dry food.  I adopted an 8 week old kitten I had been fostering, she loves to eat both canned and wet food.  Currently I am feeding her Core Wellness Grain Free wet food and Purina Kitten Chow.  I tried to switch her to the Grain Free Core Wellness Kitten Food Dry, but she can't seem to chew it.  The kibble is more like hard little nuggets, whereas the Purina is thin and star-shaped.

I really want to switch her to a premium Grain Free dry food, but have not been able to see what the kibble itself looks like before investing in a bag.  Anyone have any thoughts or knowledge of the two I have been looking at - and of the Blue Buffalo Kitten and Chicken Soup for the Kitten Lover's Soul? 

Thanks in advance!

Chicken Soup is x-shaped, or at least it was the last time I bought it, hopefully they haven't changed it (it's not grain-free though. But it is a decent food). I don't know about Blue Buffalo.

Blue Buffalo are small nuggets. I rotate that with Orijen and some others.