How hard is it to get a visa extension? Have you had a similar experience before? Since the visitor visa is issued on the assumption that the visa holder would return home at the end of her stay, I reckon CIC would ask for very convincing justifications.user828 said:HC grounds is if she was already here but that is itself very tough to get, medical grounds would make it tougher all and said - need to satisfy that one anyway.
Very tough chance, my advice is get her on regular visit visa ( buy insurance ) and extend her visa, basically have to keep doing that