Personally, I believe there are two reasons why this happened.
1) The Queen was recognizing a fellow “family pants wearer”, since she is one.
2) The Queen was giving a signal that she approves what O is doing to this country.
And I’d add that if anyone has paid any attention to the dysfunctional Windsor family, they’d know that the Obambis are right up their alley. They LOVE the libs. Only Prince Philip, that zero IQ guy, at least isn’t afraid to say what he thinks. Wish I was fly on wall after the dissing he took from M’chelle.