1) convince your wife to seek a psychiatrist . her medical report would reveal her mental condition .
2) you have as father visitation rights to your child .
3) if your wife refuses to permit you to visit your child you can move court and seek visitation rights in this regard .
4) you can also inform her parents that you want to save your marriage . convince them to have her medical check up done . they will agree if they are interested in your reconciliation with your wife .