Um, sorry, I have to disagree with this advice.
First of all, was the recording taken with her consent? Your word with some documented (not recorded) examples of her behavour should be all you need for a mental health professional.- After a while a few weeks should suffice...take the recordings to the Elders of the KH she attends explain to them that you are concerned about her mental health and play the tapes to them...DO NOT LET THEM KEEP THE TAPE unless you made a copy.
Maybe this way they can help your mom???? Big question...but at least this way you will have recorded proof...in case your mom is mentally ill and needs medical assistance.
Second, are the elders better trained in discerning "sin" or dealing with the mentally ill? Keep the elders out of it!