No it was not stolen.
Well The Mona Lisa has been stolen four times all by kings
The Louvre
22 August 1911
It was Mona Lisa and it was stolen by Vincenzo Peruggia
The Louvre Museum in 1911
When the Mona Lisa was stolen in 1911
Yes. See the related link below for the story.
Vencenzo Peruggia, a Louvre employee, stole the famous painting in 1911.
Yes, right after she was recovered (she was stolen) in 1913.
The Mona Lisa was stolen by Vincenzo Peruggia on 21 August 1911.
It was stolen from the Louvre in 1910 and found again in 1912.