I don't know the law where you live. Here in Louisiana an officer cannot take a person in for evaluation unless the
Officer witnesses the condition or actions of the subject and determines by their own observation that they are a threat to themselves or others. IE they cannot go by your mothers word alone.
http://law.justia.com/louisiana/codes/12/85245.html see (L)1
Also just FYI an officer cannot coerse you into comminting yourself unless the officer has just cause and intent to take you in reguardless.
http://law.justia.com/louisiana/codes/12/85240.html see D
If everything cleared out though just make an appointment and tell them to give you back your stuff.