Melania Trump attended the G7 meeting in Italy a year ago.
FLOTUS hasn't been seen since May 10 in her last official public duty.
U.S. first lady Melania Trump hosts a roundtable discussion with tech leaders on the effects of the Internet on children, at the White House in Washington, U.S. March 20, 2018.
Melania Trump's absence has been the subject of media speculation and even a bevy of online conspiracy theories.
The first lady had not been seen in more than three weeks.
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"Melania Trump underwent an embolization procedure to treat a benign kidney issue".
The president said last week that his wife is "doing great". She is expected to make an appearance at the Congressional Picnic in June.
Ivanka, who serves as a senior advisor to her father, opted for brown, wide-legged trousers and a white blouse for the plane ride, completing her look with stilettos and oversized sunglasses. The reception is not open to the press, the White House added.
She spent a week in the hospital recovering at Walter Reed National Military Medical Center. However, she recently tweeted that she was "working hard" and "feeling great", but some believe that the FLOTUS didn't write it.
As frenzied speculation began about Melania's quality of health and what she could possibly be doing, she took to Twitter on Wednesday to quell any untoward rumours.
The event on Monday could be the only time that Melania Trump is seen for some time.