for starters..the White House Mess is open to the public at certain times.
So yes, people can go in.
And yes, White House staff can bring guests to have breakfast.
“for starters..the White House Mess is open to the public at certain times.”
“Tours were suspended in the wake of the September 11, 2001 attacks due to terrorism concerns. In September 2003 they were resumed on a limited basis for groups making prior arrangements through their congressional representatives and submitting to background checks.
Presently, a tour of the White House must be arranged through a member of Congress. Reservations may be made a maximum of six months ahead of time, and the White House encourages tours be submitted as close to six months in advance as possible as tours are filled on a first-come, first-served basis.”
http://en.wikipedia.org/wiki/White_House_Visitors_Center
The world has changed since 911.
Anyone going into the White House will be checked..background and etc. Maybe, Ms. Kelley had a good Congressman vouch for her plus a clean background.