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As Decree Absolute has now taken place - your ex no longer has the right to occupy the property.
You should simply change the locks so that she cannot gain entry.
If she continues to attend - call the police and ask for her to be removed.
If she continues the police may themselves issue a harassment act warning. If they do not then you can consider applying to the family court for a non molestation order.
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Yes. Decree Absolute means that she no longer has a right to occupy because the house is in your sole name.
The Decree Absolute doesn't prevent her having a claim in respect of the property as part of the matrimonial finances - which will continue to be dealt with in the matrimonial proceedings - but she does no longer have a right to occupy.
You can apply to have the Homes Rights Notice removed using this form and enclosing a certified copy of your decree absolute: