She transcribes ween, and she may well mean wean instead as it's an obscure and archaic word, as /win/, but the IPA for the long vowel sound is different anyway: /wi:n/
Definition of ween | Collins English Dictionary
Others use different transcription, but give it as a long sound:
Ween - Definition and More from the Free Merriam-Webster Dictionary
I am not an AmE speaker, but I have doubts about this.