is this fraud or what would the charge be?

My sister in law was involved in an accident with another member of my family. Her mother went around to cops, insurance companies, courthouse etc. and told them all that she was my sister inlaws power of attorney and they gave her information. She is using this information to cause trouble for my other family member. She also used this information to get temporary custody of my nephew. Can she be charged with anything for doing this or is she just a liar?
my nephew was in custody of the court but living with his parents. When she was in the wreck and in the hospital her mom went to family services counselor to tell a bunch of lies and got temp custody so she can get food stamps and a check.

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