Any tips on bating the super sheep in normal game? What does work best against her?

You need to add some info onto this like if your trying it in Heroic Mode or not.

Chances are though that you will have to respec chars for single target damage.

Not heroic mode. Standard game. I have 6 barbarians, 4 archers, and 2 each of the rest. All about level 20. Abilities generally spread evenly.

I'd rather not respec, though if I do, what's the best ones to aim for? Barbarians, knights or dragons?

It's been a while since I've played the game, but as far as I remember you need one Barbarian to kill the normal sheep.

Use the Ice Mages to slow down the Super Sheep and don't let the Dragons breath fire (it will break the freeze spell). Level up the Archers as much as possible, so they can do maximum damage on the Super Sheep and try to position them in a way that they can do that damage as long as possible. The rest of the group should be near the road, so they can hit the Super Sheep. As soon as it gets out of range of a character, you should take him of the map and put him somewhere where he can hit again.

You should alsouse the Lightning and Frenzy spell as often as possible.

OK, thanks. I tried 2 knights + one barbarian hitting her (soon as she gets past one, he gets repositioned in front of her) + 1 max boost archer.

I'll try adding ice mage. maybe instead of 1 max boost archer it's better to get more with boost 3.

Done it after leveling up in Game+. The super sheep itself in Game+ was fairly easy.

It seems you already solved this, but I remember playing with 3 berzerks on a tight rotation with in frosty on the second line (which solo rotates every two squares, not buffed much). Then tried optimizing archers' placement. And I didn't respec particularly for this, just waited to be quite advanced in the normal game.

I don't remember trying it in game+ (so either I didn't do it, or as you said it was unmemorable).

That's what I used in the end, just levelled up a bit and it was piece of cake.

For game+ same tactic, only you have to add cleric on second line, since the sheep has thorns.

That rings a bell. (Or is it a biblical thing ? :-)

I normally respec nearly my entire party for this fight. One barbarian gets maxed bleed while a second gets maxed flurry and madness, archers get maxed BotS and rapid shot, one ice mage gets maxed slowdown, one knight doesn't get respecced but does get placed at the entry point for the "feeder" sheep, one dragon gets maxed bite and halitosis, and a second dragon gets maxed claw, bite, and strength. 2-3 healers get maxed inspire. I also respec Azra for maxed frenzy.

The most important thing starting out is to make sure the ice mage, bleed barbarian, and halitosis dragon put on as many stacks of their effects as possible. After they've done so, I normally don't use those three characters anymore, and instead use the flurry barbarian and bite/claw dragon as the primary melee, with potential backup from the ice mage as necessary. Keep the archers in range of the healers so they can be Zealed and remember to frenzy every time it's available and you should be fine. The book "Furious Start" also really helps here because of how often you'll be moving your defenders around. Weaker applications of a status effect will not overwrite the magnitude of a stronger version, they will only extend the duration... so once you've got the maximum poison, bleed, and chill effects applied you can use higher-damage characters to extend them without worry.

Also, the "feeder" sheep are a good indicator of your progress. There are 500 of them and they come out at regular intervals, so you can divide the total amount of health of your sheep by 500 and compare your current number of feeders remaining to your current super sheep health to see if you're on track.