All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
It is permissible for you, under Sharee‘ah, to take your wife to psychotherapy, provided that you should do this in a kind and gentle manner. You also have to clarify to her family that you are only doing so for her benefit, and they have to co-operate with you in this respect.
You, respected brother, have to turn to Allaah Almighty with supplication and imploring, and patiently persevere, hoping for the reward from Allaah Almighty, keeping in mind that everything is decreed and predestined by Allaah. You should also be eager, as much as you could, to treat her well and deal with her leniently, for "Leniency never lies in anything but it beautifies it, and is never taken away from anything but it makes it defective."
It is worth mentioning that it is impermissible for her family to accuse you of what you have mentioned. Rather, you should all co-operate and forgive each other in order to lead a happy life, based on affinity and love.
Allaah Knows best.