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wish I knew what city, if any, y'all are in.
1st of all stay completely away from introducing a firearm into the situation! Glad you figured that out.
2nd she must file for the divorce to kick in a lot of protective things for herself. Even a TRO is better than nothing.
Get him served his papers by a Constable or Sheriff deputy so they read to him the attached warnings, dos and don'ts.
Then she can change the locks and have reasonable expectations of him not entering the home univited.
A TRO does not have big teeth but it can hurt him in any further proceedings.

Take her to the Precinct Constable's Office or PD and have them give her "not issue" a domestic abuse card with the info for shelters and classes and other info that she can use right now. This can be a lot of immediate help.

Most of your large PDs no longer do Civil Standby calls but your Constable Dept. will. She should talk to them beofre agreeing to let him come to the house for any items or whatever. She is afraid of injury and there need not be a previous instance of violence .

Sarge