Mr. Vinay,
1. You draw a will. In that you specially mention that you are barring your wife to get any right in that property while giving your mother the whole rights. But there is less likely that she will survive you. Any how, as you want to give your property write a will in your mother's favour and specially dedicating a paragraph saying that your wife is abusive and cruel and hence you are not giving any property to her. Get the will witnessed by the most reliable persons to you and get it registered (registration is not compulsory, but it will benefit your mother in long future). Your wife need not know about your writing a will and get it registered.
2. You expressed an apprehension that she may forcefully enter your property. It is not clear, it is now or in future. Any how, if you apprehend that at any time she may barge into your house, being a wife she has got a right to live in matrimonial home,, but you have got legal remedies. You need not initiate any legal action right now. But if you apprehend such situation, (which did not arise in the last 3 years), you can get a stay order against her entering your premises. As a counter, she asserts her right in matrimonial home. Then, you can offer her a rented property, where you can pay rent and you can stick that you do not want that your mother be disturbed. As your wife has not initiated any action for this long period, I still feel there is hope for reconciliation.
Regards.