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 is His slave and Messenger.
If what you mentioned is confirmed, then your wife is wrong in many aspects:
1- Mistreating you and telling you off, in addition to supplicating against you without right. This is enough evidence that she is disobedient to you and rebellious against you.
2- Not informing you about this new-born baby that she gave birth to, and naming him/her without consulting you about the matter; the scholars mentioned that naming the child is a right of both parents. She is also wrong in performing the ‘Aqeeqah without consulting you because, in principle, it is the father who performs the ‘Aqeeqah and not the mother.
3- Her and her family’s mistreating your parents; this is against the example of the Prophet in treating the in-laws kindly.
To conclude, this woman is disobedient (and rebellious) and there are some religious steps to follow in treating a disobedient wife; these are discussed in Fatwa 85402. Hence, we advise you to be kind in dealing with the matter especially that you mentioned that your wife was not used to behave in such a manner.
In any case, since she is with her family, you should appoint wise people from your family and hers so that they would try to reconcile between both of you because reconciliation is good. Afterwards, if reconciliation happens, all praise be to Allaah, but if she insists to be stubborn, then you may divorce her, and you have the right to refuse to divorce her unless she gives you compensation (the Mahr or a part of it).
For more benefit, please refer to Fatwa 89039.
Allaah Knows best.