According to this article, Dhaniya was badly injured in that Net stunt due to which her left side was in spasm as she was stating it again and again.
Moreover she did want to do the current stunt but the doctors had advised her not to perform as there were chances she would get whiplash due to the current.
http://www.tellychakkar.com/tv/tv-news/shamita-shetty-continued-shoot-despite-injury-khatron-ke-khiladi-season-9-190219