If the crying doesn't bother you, leave her be. My only concern would be her losing weight and possibly becoming egg-bound. If she keeps laying eggs and you keep pulling them, her calcium could drop considerably and she'd then be in bad shape.
If the crying bothers you, the easiest thing to do would be to pull her nest box. She'll be fine, birds don't nest all year round naturally anyway. She'd stop her nesting behavior and probably stop laying eggs.
Or, as Dave_D said, you could get her a mate
