The writer who sued hadn't even published; she just had the same agent for a while. It looks like she thinks the agent was stringing her along about publishing her book (Blue Moon Rising/Masqued), and I don't know if that's true or not, but it's also not what she sued over. And it does seem it was the agent who suggested Alaska as a setting for the later series (Crave and its first three sequels), but I even if she was inspired by Blue Moon Rising/Masqued, that doesn't seem specific enough to count as copyright infringement. Especially since the settings are nowhere near each other.
It is weird that the heroine is originally from San Diego in both stories, though I can see coming up with that independently as a contrast thing. But some of the other similarities in the plantiff complaint include:
The heroine thinks she's a normal human, but she's really an extra special kind of supernatural being
They go somewhere where it's summer
The character who killed the heroine's parents wants to use the heroine to bring back their dead love interest
The heroine is 17 or close to 17, and spends time at a school in Alaska
Some of her immediate family are dead and some are alive
The heroine sees something weird on her neck before bed. As a separate similarity, she can't sleep afterwards. As another separate similarity to the other two, she wants answers. Not necessarily for the neck thing.
There's an aurora at some point.
There are vampires, witches and werewolves
The heroine and the love interest kiss for the first time and the love interest loses control of his secret powers
There's a character called the Bloodletter.
The love interest repeatedly saves the heroine, and she also feels protective towards him
They discuss if they want to have a relationship, and then kiss.
There are two stereotypical goons who aren't dressed for the weather show up and they attack the heroine until the love interest saves her.
Frankenstein, Harry Potter, Tom Cruise, Star Wars, Peter Pan, Superman, fairy tales, Dante's Inferno, Humpty Dumpty, the Hulk, Superman again, Romeo and Juliet, Sleeping Beauty, Snow White, "All for one and one for all..." "Et tu, Brute?", "that old TV show", and a variation on the phrase "Lions and tigers and bears, oh my!" are mentioned.
And that's (I hope) not counting the stuff that's not in any of the manuscripts and notes, and were just ideas the author had for later books. Or most of the repeated phrases, like "mouth [opens and closes/opening and closing] like a fish out of water" or "[I/You] owe [you/me] a life debt" or "there's no time like the present". And my favourite, "Okaaay" vs "Okaaaaaay".
Also a fan of the judgement repeatedly referring to the Blue Moon Rising/Masqued love interest as sun-kissed and a Viking, as well as the main summary in section IV always referring to "Mean Girl Taylor" and never just "Taylor".