I'm not saying people aren't entitled to park there - I have no idea. My assumption is that people share passes or whatever is required, but there could just be people chancing it as you suggest.
Some games there had been police there stopping people from doing that. Presumably it hinders the flow coming out of The Bridge which is the last thing that car park needs!
I just checked a map. Ashurst Road, at the end of Lucraft, is where we generally end up. It's a bit further to walk but you'll get that time back not being stuck in your car.
We've done similar a few times.
That first road after The Bridge gets snarled up a lot. It's narrow and it seems a lot of Albion fans can park there.
So I'd just suggest she parks slightly further back. I can't tell you road names as I don't know any.
We use the iPhone Find My Friends app...