I'm not going with my gf to the er
Why don't you want to go with your girlfriend to the er?
I'm going to make a good escape with my friends while she's going to the er.
I really think you should go and support her in her time of crisis. What will happen if they need someone to make a medical decision and she is unable to do so?
I'm going to prank her instead, I think it will be funny.
It is awful to abandon your girlfriend at the hospital. Pranking seems a bit inappropriate especially when going to the ER is serious.