She now has the Supergirl stuff (it's several updates) up for her November update. I got the highest tier, which is pricey but it gave me everything going back to the very beginning of her page, including several Supergirl shoots.

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I think the way Boosty works is you always get the back catalog, but it is for stuff at the tier you purchase and for all the lower tiers. I got the highest tier because I wanted the video, and that made available everything she's done from the beginning, which is quite a bit of content. This latest update includes these new items:
• a video of her as Supergirl being defeated by a "Kryptonite Villain." The kryptonite is a slime which is used against her.
• part one and part 2 of her as Supergirl in a photo "story" of her being defeated by the Kryptonite villain (I put "story: in quotes because there are no words, but a progression of about 12-13 photos in each shoot that convey what happens)
- a photoshoot of her tied up as Supergirl
• a video of her tied up as Supergirl
• not new, but the past Supergirl shoots and other shoots. The Supergirl ones include one of her tied, one of her wet, and one of her pretty badly beaten
I'm not sure what it is about this particular cosplayer that draws me in. She's attractive for sure, but I think part of it is her expressiveness (even if you could only see her eyes, you'd have an idea what kind of situation she's in), and that she's not someone who normally does this sort of thing (each Supergirl shoot was a fan paying her a chunk of money to do it). So perhaps there's a bit of innocence to it that is attractive.
The video is very short, but it definitely has nice production values, and loosely follows a story (although it jumps around a bit at times, so it goes more for atmosphere than strict storytelling). If you're into Kryptonite slime, you'll probably like this, although it isn't much. Compared to the pricing of other stuff out there, any piece of content on its own might be priced a good bit higher than what we're used to, but if you count in all the back content for that price, it is well worth it IMO.
Here's her page:
https://boosty.to/marikagreek
Again, I have no affiliation at all (and I'm not even the fan who commissioned this), but I hope enough people would sign up to make it worthwhile for her to do again.