My Mom's Identity Just Got Stolen. We Need Help.

Some backstory;
My mom was trying to file her taxes. When she went to complete and send it, it was rejected because it said she had already filed her taxes. Today, I woke up to a text message claiming to be from the FBI. I understood it to be a scam. However, that was not what was concerning. What was concerning was that this message had my mom's full name, social security number, and home address. And this was not just sent to me. It was sent to everyone in her contacts. She has already filed the paper work required for this with the agenies. It feels like all we can do right now is wait. Is there anything more that we can do? How do we prevent further damage, and how do we figure out where the breach occurred? And what, if any, legal actions can be taken?
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