I can't pull out a link right now, but regarding this:
Apparently there were two competing (if not opposing) ways to write her depending on who was in charge much to the frustration of Mulgrew. She ended up joking that she played Janeway as a bipolar person.
Mulgrew uses this almost as a standard joke line at conventions, really all the Voyager people have become increasingly savage to the show's writing as the years have gone on. Originally they were slightly more defensive about it outside of Robert Beltran, who bashed the show while it was on, and Garret Wang started up right after it ended. But they've all since gotten pretty savage on it, Tim Russ and Jeri Ryan have done some brutal stories about it because of how both their characters were being written as "emotionless" but what they thought was actually more stupid or ignorant. (Ryan, for example, has said she tried to point out multiple times that Seven shouldn't "regress to a child" doing basic things while also having all the Borg knowledge to save the ship every episode still in her brain. And that they never dealt appropriately with what should have been her serious "loss" emotionally and mentally being cut off from the Collective. Instead they just make her like a vulcan.)
One of the Janeway shifts is because Michael Piller and Jeri Taylor had quite clear visions of what Janeway should be initially, but Taylor after writing the background novel for Janeway (
Mosiac), started to become "expert" on the character and wrote her and tried to fend off others into the second, third and fourth seasons as to anything against her vision. That's why she got pushed out of the show. Piller originally didn't want Janeway to not be non-different as "progressive" equality of the future, he wanted her to be different as a fee-male* and somewhat of a "mother hen" to her dysfunctional crew and maybe even question her career over family choices like Picard has done, Taylor apparently changed her mind and decided against this, Piller left to do
Insurrection and Taylor started to shift things around to make her more BADASS FEE-MALE CAPTAIN TAKES NO SHIT DOES ANYTHING "FOR HER CREW" (AKA HERSELF) that leads to her character eventually turning into that version that we all like to call the villain of the show. Berman and Braga preferred this version by far, but couldn't handle Taylor as the showrunner/EP anymore apparently.
*Part of this was they realized that they had goofed with Sisko being black. Not that it was a problem, but that in the 24th Century they couldn't exactly use him as a character who has faced discrimination and so on. So they totally lost that potential hook of the advantage of having a black captain. Instead they gave him the wife grief story and the single father, then realized it was crap too lol, so he's the Prophet. Janeway differed as being the highest ranking Starfleet fee-male on any of the shows, a position previously held by Beverly Crusher, and someone in the position of authority unlike Kira. They had more justification as to how she would approach things versus a man, and Chakotay, especially being Maquis, would have been an ideal person to be the complete opposite but he almost immediately turns into a toady.