Apparently she’s was coming to the end of her contract anyway, but basically was stuck abroad (fair dos) but was asked to film a couple of short to camera pieces at home to help keep the title picture in play. She didn’t and stopped returning calls, forcing Impact into last minute reshoots to reconfigure shows shortly before they were due to air.
Perhaps more to it than that, but sounds to me like they just took an opportunity to save a couple of quid and make production easier rather than anything sinister.