Is it more in the best interest of a senior citizen to be placed in a nursing home?

or is it more for the convience of family members who don't want to be burdened with the task of careing for the senior citizen... to me, if a person can tend to their personal bodily functions, ie. bathing, toiletry, dressing, eating, I feel they should be allowed to remain in their home till their final time. My siblings view placing our mother in a home as being in her best interest. Their present task is liquidating her possessions to provide funds for her care. This action distress's her and me. At a time of weakness, my mother allowed my sister to obtain an "ultimate power of attorney", now she acts without regard for opinions of other members of the family. Do I have any recourse in dealing with my mother's situation?