She has a point. Whatever browser you use, use the "Help" function to find how that particular one clears browser history.
That's just some. Hang in there. Make your plan as calm as possible.
In a crisis moment? Know this... even if not the most graceful exit?
You can always call 911 and check yourself into hospital with kid. For a mental/emotional health screen after an abusive encounter. I know that adds to bills, but better alive with bills than dead, and in a hospital you would be guarded and it would be on the record. From there, they can help you shuttle to a women's shelter or a family shelter. They've seen it ALL, hon.
Hold your head high. You have worth, dignity and value