1. You should have filed a suit for permanent injunction to stop her from uprooting the daughter from you. In India the courts do not ordinarily upset the status quo when it comes to child custody. So it will be an uphill task now for you to get the custody of your daughter from your wife, more so in view of the fact that mother is the natural guardian of child who is below the age of 5 years. Be that as it may, when it comes to child custody the only consideration for the court is welfare of child. If you can prove that you are better placed than child's mother to secure child's welfare then you may get the custody.
2. If the court comes to a conclusion that audio recording is not tampered then it can rely on it.
3. Community head can be examined as a witness, but his evidence will be of no use. You have to prove the adultery of your wife through substantive evidence i.e watsapp conversation and other evidence that may be in your possession.
4. The courts cannot force you to stay with her, but they can restrain you from ousting her from her matrimonial home.