If it can be proven that Ms. Willis lied in her court filing, then she will be in big trouble personally.
However, it would be difficult to prove she was in a relationship with Nathan Wade prior to 2021, since they had a prior professional relationship.
If Fani Willis was counting on nobody on her staff or any of her friends testifying against her, she was stupid in filing that motion with the court.
Conversely, if someone testifies against her, their credibility will be evaluated. A single witness probably isn't enough.
This will be interesting.