Definitely not cheating. Just a complete moron.
Even if you are super using there a call is barely EV plus it just raises too many red flags. If she was cheating we'd see it on other hands. I honestly think she is too stupid at poker to cheat properly anyways.
It's really as simple as I'm gonna bluff you with this j4 by floating the flop. Then once she can;t get him off hand and money goes in on turn she convinces herself he is on a draw without understanding you need a hand to call against a draw.
Any competent superuser there would call the turn cause raising is getting you nowhere. If she calls turn she can then get him to fold river if its a blank and it just looks like a reckless bluff.