So, sorry to hear about your situation.  In the absence of a Durable Power of Attorney, you will need to have her declared incompetent and file for a conservatorship/guardianship.  In some states the guardianship process covers both health care decisions and financial decisions.  In Massachusetts, they are not both automatically granted.  If she did not have a health care proxy, you will need to file for both positions.  The conservatorship covers financial matters and the guardianship over medical.