There were a lot of undercurrents in Voyager... Mulgrew's feelings toward Jeri Ryan were among them. Her resentment that a show that was supposed to be about empowerment and equality for women was now apparently reduced to objectification... that was justified. However, her subsequent misdirection of that anger was inexcusable. As Ms. Mulgrew herself admits.
However, there were others... Robert Beltran was supposedly trying to get himself booted by increasing his demands. But despite their unwillingness to do anything productive with his character, they were equally unwilling to just dispense with him, so they gave him what he wanted. Didn't want another Vulcan first officer, I guess.
And then there was Garrett Wang... I don't know what he did, but they really had it in for him. And their puerile little "revenge" has probably exceeded even their expectations, given that so much of the Trek community still gleefully participates in it.
I wonder if all the Trek shows were this... interesting, behind the scenes.