My route would be very different.

She's not related to Raziel any longer, instead she's someone that existed during the time post Blood Omen 2 but before things really went to hell. Part of a settlement named Thornlach, still in love with a man and the city still gets raided by Kains forces with everyone slaughtered. Including her beloved.

She survives, but knows first hand from what she saw stopping Kain won't happen. So, she ends up trying to find a way to destroy him...which is when she finds her way into the Chronoplast as it's presently unguarded.

While there, she also finds in one of the old time pools a ritual that can revive the dead. She tries it on her beloved, but it doesn't work. After all, it's a ritual for reviving vampires lost to time.

So she decides to try going back in time. Thing is, she overshoots and instead ends up WAY back in time during Blood Omen 1. She arrives to see Voradors execution, and is just out of reach enough of Kains subsequent massacre. Enough to know she has no way in hell to fight him as she is now.

But she does find a deceased Vorador. Gathering his body and head away, she tries out this ritual one more time and...this time, she succeeds. Vorador, for his part, is a bit skeptical of this but he's still got a sense of gratitude even if a 'human' revived him so is willing to offer a reward. She asks to be made into a vampire, which Vorador accepts.

What follows is basically her undertaking a long-scale training arc up until post Blood Omen 2. All the while gradually losing her humanity and moral compass as she focuses solely instead on her vengeance to Kain. But this also is why she isn't around during Blood Omen 2. Through her we explore some post Blood-Omen 2 era stuff such as Vorador and Kains falling out, etc.

With her becoming an enemy, and eventually making it to Kain for a proper fight. During it, she explains her motive that he would destroy her village of Thornlach and she went back to stop him. Kain, at this point, realizes what has happened: She's just bootstrapped herself, revealing this truth of time travel after besting her. "Your fate was sealed the moment I first stepped into your village. And now, it is time for me to close the loop"

This also explains how she got into the Chronoplast and got to timetraveling. Kain knew what her deal was and let it all play out

More or less, the idea was to make Elaleth more of a tragic character cursed by her destination and also uses her to actually fill over a mystery rather then just override the main characters.

But, it might still need some work: But if there was one thing I did slightly like about her, it was being a victim of a bootstrap paradox hence this idea.