Very sure.
You are confused, or trying to mislead. Your yellow arrow lines up with the knuckle between intermediate and proximal phalanx. The red arrow lines up, roughly, with the middle of proximal phalanx and bevel #3. The knuckle between proximal phalanx and metacarpal is exactely where it should be for a proper serve - on, or close to, the bevel #2 "continental".
We actually need better pics then those blurry snapshots:
You can see the knuckle somwhere between #2 and #3 bevels, which is a " strong conti" or a "weak eastern" if you wish. Many pros use this grip for a flatter first serve, same as some might go more towards bevel #1 for more of a topspin serve.
One way or another, it's still a mod of conti grip.
You can see the grip well in this photo, too. The starting position of her feet is also clear - a very closed stance.
If you looked at her forehand grip, it seems to be a SW or strong SW (bevel #4, or slightly towards #5). Therefore, her serving grip is removed from her forehand by 70° to 90°.
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