For all her love of the status quo, Siuan showed no inclination to hold back or force Rand in any way at all. That's what got her deposed, remember?

People forget... she loved the status quo, but she had sense enough to send three Accepted she trusted after Black sisters so that Rand would not be captured. While it would have been infinitely better if she used the Oath Rod on some sisters and sent them to deal with the BA, what she did showed that she was ready to bend rules and traditions for the DR. The picture isn't as bleak as you paint it.

I doubt any of the wondergirls would have been motivated to remove Siuan. Even Nynaeve respected her too much.

Had Siuan actively started hampering Rand, then you have a case. But I see nothing which points to that. She might have been naive enough to want the world to be totally unharmed, but she never showed signs of letting that make her oppose Rand or control him (a la Elaida).