Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
Does your mother actually still have Mental Capacity
Then the choice is yours and frankly depends entirely on how you feel about dealing with forms
The forms you need are available online here
You will need someone to certify as to her mental capacity.
It is a matter of following the guides - and understanding that some of the questions are repetitive.
Alternatively a solicitor should not charge more than £300 to £500 - but do get quotes
Please ask if you need further details
You should ask her doctor to deal with it