Bernadette had a series of visions of the Blessed Virgin in 1858.
St. Bernadette of Lourdes
July 16, 1858, was the final visit of Our Lady to Bernadette.
Bernadette had 18 visits from the Blessed Virgin Mary.
Bernadette was 15 years old when she received the apparitions of the Virgin Mary.
Saint Bernadette
You are probably referring to Saint Bernadette Soubirous, who is also known as the Lady of Lourdes.More information about her can be found in this related question: http://www.answers.com/Q/Who_was_Saint_Bernadette_Soubirous
It is mainly a name to be called as an apparition that St Bernadette saw for 16 days. It can also be called Mary
Our Lady only appeared to Saint Bernadette at Lourdes. At Fatima she appeared to Jacinta, Francesco and Lucia.
Our Blessed Lady has visited a number of saints over the years, among them Saint Juan Diego, Saint Bernadette and others.
Lourdes, the site where Our Lady appear 18 times to St. Bernadette.
1858
Bernadette received 18 visions over a 5 month period beginning February 11, 1858.