I contacted Jakks Pacific, who made the Star Darlings toys, and asked this: "I have a question about Disney's Star Darlings franchise, which you make toys for. Will there ever be Starland dolls for Cassie and Piper, or dolls at all for Astra, Adora, Tessa, Clover, and Gemma? I know Cassie has a Starland outfit doll in the UK, but I live in the US."
Their response was "Thank you so much for your support for our Star Darlings line, unfortunately at this time we are no longer running production on that brand."
Then I asked "Thank you for the response! I'm sad to learn the dolls won't be produced anymore. Is there a reason dolls of the other Star Darlings or the supporting cast weren't made?" but they said they do not have that information.