Lots of things come into play for a female to become receptive. Temperature, light cycle, and food intake all play a role. Its been a long time since I kept veilds but 1 year doesn't sound like a problem. If you are keeping her properly and she is healthy I wouldn't worry about it.
It isn't such a bad thing that she isn't breeding. The market is really flooded with veilds so if it were me I'd pass on breeding her even if she was receptive.
Carl