Please note that these predictions are from your horoscope as I do not have the birth details of your younger daughter. I see that there is no marital happiness in her horoscope. Either there is no marriage else if marriage is there than changes of separation are strong. You should do proper matching of the horoscope to get a good alliance. Your daughter will be focused on love marriage, but if the horoscopes dont match then it will not be a successful marital relationship.
Blessings,
Navneet Khanna
Astrologer