14 month old biter - please help

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DD2 is 14 months and is a real biter. She's got a mouthful of teeth (about 12) and its really sore. She goes in for a hug and bites. She'll nip your ankles - arm, shoulder - anything she can get her teeth into. She also puts everything in her mouth - always has and takes chunks out of DD1 crocs - it's crazy

how can I stop her biting us? I have bitten her back, put her in her cot as punishment but nothing so far has stopped this.

Any ideas?

Biting in this context sounds like 'kissing but gone too far'. So hugs have to be conditional. You can explain it to a 14mo ... 'mummy will give you a hug if you don't bite'. No biting = nice big hug and everyone happy & smiling with lots of praise. If she bites, then you stop the hug immediately, she goes in the cot/play-pen/wherever, gets a serious 'no' or 'not nice' - resist the temptation to laugh or smile or she'll think you enjoy it really.