Many thanks for your patience. First and foremost she should consult her contract of employment to check if there is any mention in there about intellectual property rights. For example, it may state that any copyright, patents, inventions, etc which the employee has created in the course of their employment belongs to the employer or it could say they belong to her. Either way, she needs to check the contract as that is what will initially determine her rights in this situation.
If she has no contract of employment or her contract did not make any mention about IP rights, then she needs to consider what legislation says about this. The law actually differentiates between employees and contractors and states that any copyright, etc created by an employee in the course of their employment automatically belongs to the employer. On the other hand, copyrighted material created by a contractor automatically belongs to them.
In this case your wife is an employee so unless her contract specifically awarded her copyright over these works, it would automatically belong to the employer so when she leaves her employment she would have no rights over it.
I'm sorry if this is not necessarily the answer you were hoping for, however I do have a duty to be honest and explain the law as it actually stands. This does mean delivering bad news from time to time. I hope you understand and would be happy to provide any further clarification if needed. If you are still satisfied with the level of service you have received I would be grateful if you could please take a second to leave a positive rating by selecting 3, 4 or 5 starts at the top of the page. Thank you