I'm so sorry for your loss.
I'm certain you are going to need to consult a lawyer on this. I'm assuming your mother did not leave the property in trust already or put conditions on it?
Here is some information that might be helpful around how people set up trusts, particularly the list of lawyers at the end, who may have more experience in situations where a person has a mental illness. http://www.bcss.org/aboutbcss/donors/ho ... ary-trust/