What is the ruling on delaying the Dhuhr prayer to perform it at home after university hours, given that there is enough time to perform it at the university?

If the sister prays Dhuhr at home before its time expires, there is no harm in that, but she misses out on the reward of praying early. However, if she prays it after its time has expired, she is disobedient for delaying it, and she should be advised gently.