I take this as confirmation that this is her. The timing is mad sus. Why would she respond to a random tweet and call out those tweeting at her as "obsessive?" How would she know that? Plus her hair looks the same as in the photo's Phil shared with the world.
I'm sure regardless of if that's her or not her phone blew up with tweets about everything.
What I feel like people are missing is how disgusting Phil's MO for coercing young and impressionable girls into being his live in maid is. When he did it with Leanna at least the age gap was sort of close, but there's a lot of similarities between him starting to date her and this time.
Both are (almost surely) much younger than him.
He meets them online where he can project a certain image to them until he can convince them to meet in person.
Meeting in person is always at his place or at least infrequent and away from the girl's home.
He splashes cash and does his best to impress them (not wrong on its own) but since they're in an environment controlled by him it's not like they can just peace out.
Since he can hide his worst character traits and make up for things with money he does his best to pressure them to move in.
Once they've moved in they're pretty much stuck. It doesn't matter how toxic the situation is when you're halfway or more across the country and almost entirely reliant on Phil for all expenses. Even of the new gf has a job now if she moved she'd have to find a new one.
This also takes them out of their support environment since they can't just go back home easily so Phil can string them along with just enough attention/gifts to keep them around while he insists they do more and more for him, since if they refuse they'd pretty much be out on the street in a city they don't know and hope their parents can bail them out back to back home.
It's a really gross and creepy systematic sort of abusive relationship. That's why he's so pushy she move in after only meeting him 2-3 times, once she's done she's basically trapped.