Depends on how far back you want to go...
The first few arcs of X-treme are good, but Rogue fades out after issue 19 iirc. She comes back at 31, powerless, and stays on for the rest of the book.
Austen/Milligan is skippable. I wasn't a fan of what Milligan did with her. All it was Romy angst and little to no attention for Gambit and Rogue's separate characteristics.
There's her Rogue solo but tbh it's not well-written and has a weird origin story.
Further back I thought the Revolution issues with Rogue were decent. I liked when she beat Wolverine using her smarts.