Khula'

Q: My daughter  has been married  for 6 years and separated from her husband 10 months ago. She has been asking for talaq but her husband and his family have been playing delaying tactics. Finally they have agreed  to give her talaq and have asked her to do the following:

1. Request talaaq by email message 
2. Return the mehar given to her at the time of nikkah and return gold jewellery given to her at nikah. Will this be classed as khula talaq?

Will it be baain/ complete  talaq?  

She also has gold jewlery given to her by her grand parents at the time of nikah is she entitled to claim this?

Q: What is the ruling on Khula' and how much can the husband take?

Q: If somebody's husband is impotent then is it permissible to ask for khula? Is impotency a valid reason to ask for khula?