Minnesota Common Law and property rights

This question regards the county of Anoka in the state of Minnesota.

Unfortunately I don't know if this is actually the right area of the law for my question. But my sister's father died about two years ago
and left his house to her (in her name). Since than she has not lived there
or had any involvement with the house other than to visit my mother
who has lived there and is paying off the house and maintaining it,
including various spendy restorations (roof, deck, etc.) Now my sister
(who is 21) is running wild, acting like a spoiled 16 year old with
no job, no place of her own (she lost hers for not paying the rent) no priorities and no goals. She and some of her friends are
under investigation by the Anoka County Sherriff's office because they
stole my mother's checks and forged $170 worth . And she
herself called the phone company and fraudulantly made them believe
she was my mother so she could get extra services on my mother's phone
account and order a cell phone on the account. Because of all this,
my mother no longer trusts her, will not let her friends stay over
and will not even allow my sister in my mother's room(keeps it locked
when she's away). Yet my sister keeps breaking into my mother's room
to steal things and having these unwanted friends over. So my mother
wants to have the house transferred to her name. My sister already
agreed readily to sign any such papers when the subject was brought
up before, saying that having the house in her name would prevent her
from getting state aid for her and her two baby girls. But they live
with thier father now and she only see's them every other weekend.
So the way things are going I fear she may not readily sign the house
over. Is there any tenet of Minnesota Common Law or any other part of
Minnesota law that may provide my mother any helpful rights in this
situation?