The first lady explained that both she and her husband will "always pay tribute" to the United States' military, veterans, and "the families who love them".
She underwent a surgical procedure on May 14 to treat a benign kidney condition and was released from the hospital on May 19.
Melania herself has dismissed speculation over her whereabouts, insisting she is at the White House in a tweet sent last Wednesday from her official account-although even this did not prevent people from speculating that the tweet may not have been sent by Melania.
Melania Trump is set to make her first public appearance in nearly a month on Monday, as she joins her husband President Donald Trump in hosting a White House event for gold star families.
Un million de fumeurs quotidiens en moins en 2017 — Tabac
Selon les chiffres de Santé publique France, 26,5 % des 18-75 ans fumaient chaque jour en 2017, contre 29,4 % en 2016. Prix: mettre le paquet! L'Italie, la Belgique ou Andorre auraient vu leurs ventes augmenter en conséquence.
Last weekend she stayed behind in Washington as Mr Trump and many of his immediate family went to Camp David. The reception is not open to the press, the White House added.
A CNBC journalist wrote on Twitter last week: "Not that this will deter the conspiracy theorists, but I saw the First Lady walking with her aides in the West Wing yesterday afternoon".
"She will not attend the G7 and there are no plans for her to travel to Singapore at this time", her spokeswoman, Stephanie Grisham, said in an email on Sunday.
Trump also told reporters before the Naval Academy commencement on May 25 that the first lady is "doing great", and her longtime friend, Paolo Zampolli, said she seems to be "recovering well".