Antique painting, portrait of a gallant woman signed early 18th century

Very beautiful painting, oil on canvas, French School of the 18th century, representing the portrait of a gallant woman from the front, holding a face in her hand. She is represented sitting on a bench wearing a pretty draped dress in cream tones and a red cape. She has an elegant two-row pearl necklace around her neck, as well as a jewel on her dress. In the background we can see trees and a building with a blue dome and an interior courtyard in front of which is a fountain. Oil on canvas in a wooden frame, and gilded stucco, richly carved. Presence of a trace of signature at the bottom left, perhaps, Constantin, Netscher (1658-1723), but to be confirmed after cleaning and removing the old varnish because we cannot see all the letters of the signature. Two labels on the frame at the back and an inventory number 120. The painting is in its original condition, there are no snags on the canvas, the varnish is dirty and it would benefit from being cleaned, so as I said, to be able to fully identify the signature and for it to regain its shine. The frame has some accidents and is missing. Frame size L 55 cm, height 67 cm. Canvas size L 37 cm height 47.5 cm .