Usually I don't prefer "stereotypical" Happy Endings...

Warning - all written below is a spoiler, only concerning the real Effie's life.

I read a lot of Effie and their story, and may say she was happy with Everett for sure, but never got Ruskin completely uninvolved, speaking about the rest of her life after their separation. She suffered from sleeplessness ever since, and her nervous state wasn't as steady as it was before.

There might be something seriously sinister in the way Ruskin treated her; because of the letter Millais wrote to someone after the marriage. It seems only then he knew very nasty things about Ruskin's behaviour towards Effie, and ever since he would never talk about Ruskin with respect. Mind you, even in the times when the result of the separation and all that wasn't sure at all, Millais was ever expressing his feelings rather high for Ruskin, being even sorry for him!

Millais was a very nice man, loved by anyone. He worked hard, now he had a big family, and some people said, without a family increasing constantly he might achieve more greatness. In fact, he became a very well paid portrait painter, rather than being a risky member of PRB of his previous days. But then that PRB of their youth ceased to exist. Everyone moved in other directions - no one was young and rebellious anymore. So Millais fate was not exceptional.

They were getting very well together, Effie and Everett. But the family life brought illness, hardships in pregnancies for Effie, eventually she became far from being as healthy as in her prime. In the end she got nearly blind. They lost several children.

But surely they matched one another extremely well. Millais wasn't a very educated man, he was too preoccupied learning his Art, whereas Effie knew several languages and was a person always eager to socialise. She acted as a translator in foreign languages to him when they were abroad, in many ways making it easy to get on with other people.

Back to the shadows of previous marriage, they were much more serious than you can guess. In fact, Effie wasn't divorced. She was proved to be a virgin, and because of that Ruskin presumed to be impotent - so she just stated as being not-Ruskin's wife, called Miss Gray again, but! Till the day he would deliver the proof he was not an impotent man. In the times of the proceedings, he preferred to stay away and not defend himself in any way. It doesn't mean he was impotent really, maybe he was just too glad to end the marriage even in such way. Through doing nothing. Which maybe suited him, right?
But the weirdness of the law meant, that if suppose one day Ruskin marry and this woman produced a child, that very day Effie would be called Ruskin - not Millais - wife again, and all her children with Millais - illegitimate - as well as the supposed Ruskin's newborn child. It sounds mad, but such was the law.

To do what she'd done was very trying, as you can see.
Once, Ruskin really wanted to marry a young girl, one Rose la Touche, but thanks to her parent's interference, in fact Effie's response to the letter Mrs la Touche wrote to her, asking some questions concerning her previous marriage to Ruskin, in the end that dangerous for all of them second marriage never happened.

To mention other unpleasantnesses, the Queen Victoria, prude, refused to receive Effie, whereas Millais was welcomed to get a title. So it was for him, not her, to accompany their daughters when they went to some high-class gatherings. Back then, one had to show your daughters as respectable brides-to-be, you know. And only when Millais was dying from a cancer, Victoria asked what she might possibly do for him. He expressed a wish she met - admitted - his wife. Which the Queen did.

Effie outlived her husband by kind of a year. People said she lost her looks very quickly, whereas Millais remained strikingly handsome till the end. Still, I think she was quite a happy woman (noting though that she wished to go through less than eight childbirths, every time followed with long illnesses...) Such was the irony, speaking of a woman who wanted to cease her virginity above all.

Partially. There are things that never fully go away in your subconscious, no matter how happy you are. I was emotionally treated poorly by a boyfriend in the past, and while it did go away in a sense (took a while), there are still some things that I remember without even thinking about that still make me uneasy regarding some things in new relationships. So yes, it does fade away, but I wouldn't say that it completely goes away. Especially since Effie was so young, in the crucial age where everything you experience is important and has a lasting effect, so I do think it will have a slight effect on her future life. I'm not saying she won't be happy though.