Your lagna is Dhanush lagna.
Sani is in lagna.Sani is seeing seventh house.
This is very bad point.
You have to do penance for one year.
Please see in google–Penance method to clean
Looking at the horoscope of your sister we see that her lagan is Sagittarius and Rashi is Virgo. She is born under the Chitra Nakshatra. Jupiter mahadasha and Saturn anstardasha is going on. Saturn is the planet of delays and obstacles and therefore there is a delay in her life. However the period is strong in 2017 for getting the desired results.
As per Nadi Astrology, she should get married by May / June 2017. She must recite ‘mangal shloka’ (‘Dharani Garbha Sambhootam …..) at least 70 times daily for 100 days. Best wishes for a happy married life for her. God bless!