Iddat for a revert woman previously married to a Hindu

Q: Few months back my very close friend started to like a Hindu girl (who is married to a Hindu with 1 child). Me and 1 more common friend knew about it. We advised him to move away but this girl was separated from her husband (but still in marriage) as this guy used to drink and beat her up. She is not happy rather scared of him. On our explaining, he convinced her and she had converted to Islam. We follow hanafi fiqh and as per our knowledge her previous relationship (marriage) is finished with Islam. 

Is it okay for us to do my friend's nikah with her after completion of iddah (3 periods). Is it allowed as per Islam? There is no way she wants to go back to her husband as she is already separated. Doing divorce will cost a lot in Bhutan (her own country) and she can not afford it? Please guide us if we can do nikah for him and her.