It's not an astrology term - it's a pop culture term.
Six degrees of separation is the theory that everyone and everything is six or fewer steps away, by way of introduction, from any other person in the world, so that a chain of "a friend of a friend" statements can be made to connect any two people in a maximum of six steps. https://en.wikipedia.org/...Six_degrees_of_separation
So she's just saying that Kate will affected because she is wife to one heir and mother to another but will have no direct influence over decisions made or events occurring at this time, nor have her future directly impacted as a result of these events.
Adams says of another eclipse that occurred in April 2013:
Back on April 10th 2013 you read a prediction about a crossroads for the Royal Family: ?We have a partial lunar eclipse coming up on Thursday 25th April which falls at 5 Scorpio 46 and 5 Taurus 46. This triggers the astrological charts of Prince Charles, Her Majesty the Queen and Prince Phillip.?
The Succession to the Crown Act 2013 was given Royal Assent on exactly this day, 25th April 2013. It was an Act to make succession to the Crown not depend on gender ? and to make provision about Royal Marriages. It means a very different future for Prince George...
THE ABDICATION OF QUEEN BEATRIX
Why else did that April eclipse matter? Her Majesty Queen Beatrix of the Kingdom of the Netherlands abdicated on 30th April 2013 to make way for her eldest son, Prince Willem-Alexander and his wife Princess M?xima.
So it looks to be that a major, hush-hush decision will be made with regard to money/inheritance/property of the BRF but not made fully public for some time.