Hi, thank you for your question. Inheriting his estate does not automatically transfer the title of the land/property to her name and she needs to undertake a transfer of the land to her name, after which she will be free to sell the property.
There are different applications depending on whether the property was in his sole name or not and you can check here for the specific requirements: https://www.gov.uk/update-property-records-someone-dies/update-property-records-someone-dies
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My name is ***** ***** I have been a solicitor for more than 30 years.
I note that the property is in your late father's sole name and that he left a Will.
Your mother will need to obtain Probate of the Will if she has not already done so.
This can be done in person by the named Executor at the local Probate Registry if that is preferred
Once probate has been obtained the the property can either be sold by the Executor or it can be transferred into the name of your mother using an
AS1 and App1 and then sold.
Please ask if you need further details