I'm giving this to Tsunade. The majority have covered the basics, but nevertheless I'll give my input. Alright, so the OP has set the knowledge at full, meaning Tsunade is aware that Hidan must enter his circle in order to carry out the ritual. Tsunade, however, has shown means of erasing that circle; all she needs to do, is use Heavenly Kick of Pain [
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]. Now obviously this covers quite a large AoE, so riding the circle shouldn't be an issue to Tsunade -- the sheer destruction inflicted on the ground should cause the circle to fade. As for this talk of Hidan drawing the circle out of Tsunade's reach, that's futile; Tsunade can easily send half of Katsuyu or even one of the minis to erase the circle. Hidan has no means of eliminating the slug as physical attacks are pointless against her, and he'd be busy with Tsunade herself as well as Katsuyu's other half.
Moving on, Katsuyu's recent feat suggests that Tsunade
could give Hidan somewhat of a headache. As we've recently seen, Katsuyu is able to split into two versions of herself, and seemingly, both possess the ability to shoot acid [
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]; now I'm not sure how Hidan would react to this - it's highly doubtful that the guy could dodge two acid shots from different directions. I mean, the attack bares no prerequisites [
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], so Hidan is more than likely to get caught by at least one of them. If he does, his body will corrode, and he'll be rendered immobile.
Another route Tsunade could take is taking full advantage of the BPD (Body pathway derangement technique). Touching Hidan will be hard, as he does actually have some pretty good evasive feats, but he being a CQ combatant, Tsunade could pull it off. Hidan has shown his knack for wanting to close quarters [
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]/[
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] and it was canonically stated that he finds ranged attacks to be more or less pathetic [
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]. If he does come close, Tsunade has shown the ability to send someone off balance, and this is only with one finger [
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], so I imagine a full on punch with Byakugo activated would completely obliterate the ground Hidan is standing on. Should that succeed, Tsunade can get the necessary touch to render Hidan immobile for at least a while; there's no way he's going to figure out how to move as quickly as Kabuto did; for one, Kabuto is a genius, while Hidan is borderline retarded, so yeah... that should give Tsunade time to land a devastating punch, but I imagine that woundn't do much to Hidan, so Katsuyu is gifted with a perfect opportunity to spit acid at him, and that should end the fight.