There are tax implications, but only longer term:
CGT for you when you sell the house if it is not your principal private residence
Possbility of IHT being payable if your mother does not survive 7 years from the date of the gift.
There are also care home fees implications for your mother. If the local authority can argue she gave the house/money away in order to avoid paying such fees they will and you/your mother will have to pay, possibly by selling the house.