How does Della speak? Does she have any identifiable speech patterns?

Whenever Della speaks to Jim, she has a tendency to say a lot, all at once, before giving him an opportunity to respond.  In fact, she often asks a question and then continues making statements without actually allowing him any word edgewise.  It seems to convey, in part, her nervousness about his liking her hair and her desire to smooth things over and make him happy.  
When he first gets home, she says,

"Jim dear. . . don't look at me like that.  I had my hair cut off and sold it.  I couldn't live through Christmas without giving you a gift.  My hair will grow again.  You won't care, will you?  My hair grows very fast.  It's Christmas, Jim.  Let's be happy.  You don't know what a nice—what a beautiful nice gift I got for you."

In one speech, Della gives him an instruction, an explanation, a statement of reassurance, asks him a question, gives him further assurance, another instruction, and then, finally, another sort of explanation of the gift.
Then, a short while later, Della tells him,

You don't have to look for [my hair]. . . .  It's sold, I tell you—sold and gone, too.  It's the night before Christmas, boy.  Be good to me, because I sold it for you.  Maybe the hairs of my head could be counted. . . but no one could ever count my love for you.  Shall we eat dinner, Jim?"

Again, Della repeats much of what she has said before in a steady stream of words that do not permit Jim to speak.  She seems so eager to please!