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In these circumstances, you can apply for an order for sale(s) in the County Court and an order that the court signs the Transfer document (s) in place of your co-owner - taking only three months or so and will be expensive!HOWEVER there is also the option of the daughter making an Emergency Application to the Court of Protection for an order authorising their agreement to the immediate sale of the property which would be even quicker.
As no doubt you are aware, any Sale is likely to take a few weeks, and there is nothing stopping your Solicitor getting the ball rolling now and to deal with any enquiries that your Buyer and his Solicitor may raise. So, while this is being delat with, daughter can crack on with the Court of Protection, and hopefully everything will fall into place!
I'm afraid there are no legal grounds to sue the Court of Protection for any delays in them granting an Order.
I hope this assists and sets out the legal position.