Taro and his men surely have seen Sakura arrive with Kakashi so maybe they're more likely to assume she's closer to him in skill than not? The flipside would then be them overestimating her and overwhelming her. Then again, she could surprise them but I don't see her lasting too long if they feel the need to go all out and then take her as some hostage. I would figure they'd send reinforcements to get her. I don't see Sakura deviating too far without Kakashi, as she knows it's risky.