She was arguably a bit careless in the moment that lead to them getting caught, and since pushing that stack of fliers wasn't really useful for their greater aims, that kinda proves your point as well. The idea of the White Rose not getting caught, so rather shortly before the end of the Nazi regime, and Sophie Scholl writing more letters, or even books, is fit to make me cry with homesickness. It's an unspeakable loss.

But otherwise, if you read the interrogation transcripts, I don't think she regretted anything. She knew what she was doing and why she did it, and she knew she did well. IMO her life ended so much better than that of people who just give in to pressure against their conscience. It's not like those are immortal, and then they have to spend the rest of their time with who they became, too. Some find a way back, most don't. As Shakespeare wrote, the coward dies a thousand deaths -- Sophie Scholl died but one, and it was rather majestic, if you squint just right.

I still wish she would never had a chance to prove her greatness in this particular manner and had survived instead, so don't take this as me negating your point.