Translation:I believe her
I share some sentences with the verb "kuamini" in the link below (prepositional verb "ninamwamini"):
Illustration: Perhaps you have a friend of whom you would say: ‘I trust that man.
Mfano: Labda una rafiki ambaye unaweza kusema hivi kumhusu: ‘Ninamwamini mtu yule.
Yes, according to the TUKI (Institute of Kiswahili Research) dictionary:
2 trust, have faith in, put confidence in; entrust