Marvel and dc have many heroes with the same name. From sandman to scarecrow. Also marvel could just rename her if they want.Yeah, her body was destroyed - but that's happened to Vision before and he was rebuilt, so they can bring her back. Unfortunately, another comics company has a character called Robyn Hood, and the writer who wrote her issues is no longer writing for Marvel, so she's probably gone for good.
She'd be redundant on the Champions anyway, since Kamala or Viv can do all the same stuff.
As for the same powers avengers has had thor and hercules in the same team plus other heroes that have powers that are alike but their personality is not the same. Heck thor corps they all are thors with the same powers and spider warriors team are all Spider-Man. But they didn't act the same.