Is Hoda Muthana a US citizen & should she be allowed back in the US?

The Supreme Court refused to hear Muthana’s case without comment. So I guess that means she’s SOOL? Or can she file in a lower federal court still?

Social media posts during her time with the extremist group show Ms Muthana applauding terrorist attacks and encouraging other Americans to join IS.

So it seems she was actually an influencer on social media, so there should be some evidence against her if she ever did make it back to the US and stood trial.