This bit is a surprise:

The surprise decision came as part of big changes behind the scenes when Neighbours was renewed on its new multi-year deal. Eve went on to film her final scenes in December.

When we asked the all-important question of why she left Neighbours, Eve replied: "It was a decision made by the production. From what I understand, at the end of 2017, the show was at a point of: 'Is it going to go ahead, or is it not?'

"In the end it did, but there were going to have to be big changes and every department suffered that. When it comes to the cast, I was one of them.
As if 10 were thinking of cancelling the show. No idea what the ratings are like but it's been on as long as i've been alive, and growing up in England it was our window to what Australia was like (this and Crocodile Dundee....). The lifestyle looked exciting, weather amazing, all that.. Neighbours, Paul Hogan, and later H&A probably did a lot for Aussie tourism at the time. Cancelling Neighbours would be like cancelling Eastenders or Coronation St.