my girlfriend has a active felony warrant can she still get the help she needs without being arrested at this facility before turning herself in? thank you...

Yes,No Police are allowed inside.

I saw a man arrested in the ER here years ago he was awaiting to go to the psych ward i believe.

I’m not sure about the above information provided. I think she should be able to get the treatment she needs, but she will be arrested and taken into custody upon her discharge from the hospital. I have seen that; the officers come right to the door.