If mom tried to kill herself, can I get guardianship over her?

Most probably, I would suggest seeing an attorney with all of the details.

The short answer is yes. Here are the steps: Petition filed in probate court by person interested in individual's welfare, Petitioner notifies individual, in person, Petitioner notifies interested parties, such as family members, by mail, Court may order examination by mental health professional, Court appoints guardian ad litem. If you feel that this is an emergency situation, the court may allow you to bypass the notice to interested parties and allow a temporary guardianship until full notice can be given. Although the process is fairly straightforward, you may want to seek the input of an experienced attorney in your area to help you through the process and get this done as expeditiously as possible.

In Michigan, you could Petition for Guardianship. However, the court would seek an evaluation of your mom by a medical professional to see if guardianship was necessary.