In order to do anything at all, your answer will have to have full mental capacity. The following assumes that she does.
It is relatively easy to remove an attorney by doing a partial deed of revocation as explained here
however replacing attorney is a lot more problematicalwhich is going to require another application.
Here is an interesting article on the pitfalls and problems
can I clarify anything for you?
A solicitor will normally charge £600-£800 plus the court fee.
There is no reason why you cannot do it yourself and save those costs.
Please rate the service positive. It’s the process by which experts get paid.
We can still exchange emails. Best wishes.