Interesting observation.
I keep looking for her trigger ... don't see it. Virtually no lower body load. Front foot stays flat on the ground. Upper body load leads and I wonder if she'd uni-load in the box. Don't see much in terms of separation. To me this resembles a gated swing and I question if it will work well against good pitching. I'm in the minority here.
Any game swings?
FFS, I believe your observations are correct. This girl has a very typical fastpitch gate type swing. This is the most commonly taught swing in my area. Probably 7 out of 10 girls on our 14U team swing like this. This swing really begins to break down against good pitching. It's ok against average pitching. We have one girl in particular on our team who has been taught this swing for 3 years. She is a very dependable contact hitter against average pitching that will occasionally get her pitch and get a nice hit. Against better pitching she really struggles getting it out of the infield, and hits most balls to the second base girl. If the pitcher has decent control, it is a very easy swing for the pitcher to counteract. Throwing the ball on the inside corner above the waist or low middle-half out, will usually get the job done for the pitcher. Middle to outside high, seem to be the sweet spot for this particular girl.
IMO, instructors that teach this type swing are mired in the past and are not fully up to speed on the transformation that is happening in fastpitch hitting today. One specific example is the minimal to almost non-existent negative move. Minimal in the upper body, non-existent in the lower body. The reason hitters in fastpitch aren't taught to perform a negative move is because their instructors don't believe there is time. So what you get is a hitter that basically just stands there with their hands held at ear level, and then they swing. No load, no running start, and very little adjustabilty. The reality is that the hitter has from the time the pitcher receives the ball back from the catcher to the time the ball comes out of the pitcher's hand to start their negative move. IOW, they have all kinds of time.
Sorry for the long rant, I just see this type swing being taught in my area a lot, including girls on our team, and it drives me nuts because it makes it harder for the girls to get on base consistently against decent pitching. I don't know about the girls on your teams, but the girls on our team don't have as much fun when they aren't getting on base. The look of frustration on their faces just tears me up.