I would think almost any poem that she found enjoyable. Start with "silly" ones, such as:
I never saw a Purple Cow
I never hope to see one.
But this I'll tell you anyhow
I'd rather see one than be one.
See that birdie in the sky?
He dropped something in my eye!
Me no worry, me no cry,
Me just know that cows don't fly!
I've found the "Read-Aloud Poems For Young Readers: An introduction to the Magic and Excitement of Poetry", edited by Glorya Hale, is an excellent all-'round poetry book. It has good stuff for young ones, yet "classical" poems, too, such as "Barbara Frietchie", "Oh Captian! My Captain!" and "I Hear America Singing".