That is quite likely. There are two possibilities, which are not mutually exclusive. One is that she felt that they did not do an adequate job in following up and ensure that her complaints were being properly handled. The other involves the process known as "packaging" in which shows are sold based upon a producer/showrunner and a star being put together as a package and sold in advance based upon business instead of creative concerns, which is controversial for a number of reasons (the writers have been most active and have threatened to strike over this, but a lot of actors, directors, etc. don't like it either) one of which is that agencies often receive a fee and/or profit participation as part of the overall deal and so are more concerned with the series' success rather than their clients' best interests. A quick bit of Googling shows that a number of the cast members share the same agency as her including the first announced co-leads so it is possible that they were part of the "package". If I was being assured that things were being taken care of and found out they had been swept under the rug while the people who are supposed to be representing me were taking money from the management that was ignoring the abuse I would be pissed, maybe not believe that they were in the dark too, and consider firing them as well. While we don't know for certain what the contractual relationships between the parties are it's a definite possibility, maybe even a probability, given what we do know.