You communicate from one side of your brain, while your wife communicates from both sides of her brain. This is a basic biological difference in the brains of men and women. This is based on actual physical differences in the brain that are present at birth – it is not a result of learning or culture.
What does this difference mean? It means she has more to say about everything – she has more words. What’s more, she needs to express those words to feel she has been heard. If you cut her off or ask her to bottom line it, she will feel you don’t care or could not possibly have understood her. The difference also means that her “more words” will tend to run you over – actually making it more difficult for you to understand her than if she had said less.
Is there middle ground that will let her be heard and you have a chance to actually hear her? Try letting her talk till she is done, than asking her for a brief high points review so you will be sure you have heard what she wants you to hear.
Bonus: Try very hard to avoid that universal reaction to being run over with words – the eye roll. Odds are she will take an eye roll as meaning something other than “I am drowning in verbiage”.