What a pretty girl! ♥
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polish does have the crest but doesn’t have feathered feet.
Just a guess but could she be a Marans/Cream Legbar mix?
Is she laying yet? maybe a green egg?
agree with @Brahmachicken240 about this. Also, you said she's bigger than you're cochins, and in the pic you have with the cochin, I can see that... I think the reason is that you appear to have bantam cochins. That would make this lady a standard size.
I have a hen with a similar silhouette who is a cross between a Spitzhauben and a Cochin. She got her crest from the Spitzhauben, and her feathered legs from the Cochin. So it is possible that a Polish is part of your hen's background, but that the other parent contributed the feathered legs. It will be interesting to see what she lays! Here's a pic of my cross for reference:View attachment 1663054
She doesn't look like any breed I know. If you can get a list of breeds the hatchery was selling at the time you bought the chicks, we may be able to narrow it down. It may be a breed that is simply unfamiliar to us, since you are in Pakistan. It could also be a mixed breed if you bought from a backyard breeder, but since you say you bought from a hatchery, it seems unlikely.
She looks to be an Easter Egger with Marans, Legbar, and Australorp in her bloodline.