Others will have to explain the conventions around here, but to me it goes like this.

Separation: spouse announces that the relationship is over. ILYBINILWY
Bomb: spouse announces that she wants a divorce (I haven't made it there yet)
Leaving home: after some sort of cohabitation, spouse leaves the joint home
Divorce: papers are delivered or signed

In your timeline, your spouse left home (4/14/2014) before the separation (5/25/2014). I'm not sure how that works. She didn't tell you why she was leaving? She called it a break so you didn't consider it a separation?

M39 D6 D3 (at S)
S 2014-09
D 2016-09

"You can't start a fire sitting around, crying over a broken heart" - Bruce Springsteen.