The new lawsuit is a counter-lawsuit to a complaint filed by two Jane Does who sued Trevi and Andrade last year.
The indie label is home to Peso Pluma, Jasiel Nuñez and more.
The pop star is now repped by Brandon Creed's Good World Management, sources tell Billboard.
The firm has experienced a recent mass exodus, leaving its roster in flux.
Jakob Nowell will play with Sublime's original surviving members for the first time later this month with the possibility of more shows to follow.
The new venture, called To The World Soon, already has a half-dozen clients in addition to the Def Jam-signed singer, whose tour kicks off today.
"We're not afraid to take chances because Dolly doesn't go on everyone's highway, she creates her own path," says Parton's manager Danny Nozell.
Elsewhere, the singer expanded the role of her brand manager, Leslie Matthews Dugger, and hired Tyler Lewis as her management coordinator.
Raymond Acosta will lead the group's management team at the company, which includes Karol G on its roster.
Monet's manager, Rachelle Jean-Louis, says creating "as bulletproof of an identity as possible" for the singer-songwriter prior to JAGUAR II was key to its success.
