No she can not. However if you refuse your consent she would be entitled to an order from the court that you sell. This would involve legal costs and increased animosity between you both. Try to agree a time limit for the sale, and if you are to stay in the house tried to agree that you pay her some ' rent ' in respect of her share.
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• Get a divorce
• Have contact with my children
• Make a small claim
•Write a letter of claim
•Obtain a Grant of Probate
•Get legal advice and help with my case
•Make a Will
•Change my Name
•Prepare a legally binding agreement
• Sever a Joint tenancy
• Prepare a Partnership Agreement
• Sell a Jointly owned Property
• Appoint a Guardian for my children