I've been wondering about Karin for a while, she doesn't really have any fighting feats except against Guruguru, but I think that she's a better kunoichi than Kushina, or she has what it takes to surpass her one day. I mean, Kushina never showed any Sensory or Medical skills, just her Chains, so Karin beats her here. She can use a lot more techniques than Kushina (I'm talking about Kushina because she's also a member of the Uzumaki clan and she's also capable of using the Chakra Chains).
It's been stated by Orochimaru that, unlike Karin and Suigetsu, Sasuke's powers are still not at their maximum, and then this happened:
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Seemingly, Orochimaru was also surprised by Karin's progress and it looks like even he didn't know that she can become any stronger.
As for her Medical skills, she treated Tsunade, who was cut in half moments ago, and has been healing Sasuke and Taka for a while. Okay, Tsunade and Sakura's Byakugou for example is probably better, but Karin's self-healing is on a different level in my view. Just look at this:
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She was literally skewered, and yet, she just bit herself and she was like "screw you, that's child's play". Not to mention her Sensory skills, which are at least on par with Tobirama's, if not better, because the feats lol. Do you guys agree that Karin is one of the strongest females in Naruto, even though she doesn't have raw strenght?