The short answer the question is no she can’t. She cannot make any gifts that your mother would not have been in the habit of making.
She can only use your mother’s money to benefit your mother unless she has consent of the court of protection and she is under a duty to account for every penny.
So whilst you may have got less than your other sister, none of you should have had anything.
It is largely irrelevant what your mother promised and whether the attorneys were carrying out your mother’s wishes unless your mother knew exactly what she was doing and your mother instructed them to do that.
What can be done? You can report the whole matter to the Court of Protection with a view to having her removed.
I don’t know what your mother’s life expectancy is but if she lives a long time and the care fees gobble up all the money in the house, (apart from the GBP23,000 disregard) then the local authority would look to the recipients of the gifts to repay the money.
This is a matter for the Court of protection to remove her.
Can I clarify anything else for you?
I am happy to answer any specific points arising from this.
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