Please suggest me

Pata nahi what to suggest. Other than being her support, talking to her patiently - cajoling her into letting go slowly starting with small things. IMO, I think if you can be present with her at all times you can convince her, appeal to her, for example - "please, bas ek baar - don't wash your hands.. lets see what happens" , hold her hands and show her how you didn't wash your hands... such type .. Kind of deal with her like how you deal with small babies(patience, gentle, care, love, some funny tricks type - playful and so on).. maybe it will help her. Other than that, I don't see any other alternative. I don't think there can be any medicine for such problems, other than love, and most importantly desire to change on part of the person herself..