Hi Rebecca is a very pretty Violet. It likes the same kind of conditions Pansies thrive in and prefers mostly sun, especially in areas that are not too hot in summer. Some Viola species do well in shade. Viola odorata and cultivars do especially well with quite a bit of shade.
I just purchased this "Rebecca" Viola cornuta .... and from what I have read, it needs to be in a partial shady area. Is your "Rebecca" different from mine?