Pre New 52, Carol Danvers

Battle in Metropolis

Morals off, Bloodlusted

Start 1 Mile Away

Supergirl wins because Jane Foster sucks.

Team

So does Carl Manvers

That too.

Kara could win. The only who poses a threat is Jane.

Basically Jane vs Supergirl, I'd say Supergirl wins by consistent showings.

Jane should carry

Even though I hate her, femthor wins.

Team wins. Jane Thor is a very hard fight by herself.

Jane is a good fight for Kara alone, but I don't think the other two can quite pick up the slack.

Supergirl 8/10.

Supergirls wins. I don't even see Jane is a problem. Characters right at the level of low high tiers like Superboy, Wonder Girl etc are easily dispatched by Supergirl.

As much as I hate Jane, she can probably beat Supergirl solo. She's held her own against Hercules in an arm wrestle, helped pull the Grandmaster's machine which was a half planetary feat of strength at least and she's better at countering speed than Odinson based on her fights with Angela and Gladiator. Adding in 2 minor distractions on top of someone who can give Kara one hell of a fight is enough to give Jane an opening that would be disastrous for Kara.

It could go either way.