Should I try to get my gf an uber?
Why are you getting an uber for her?
Maybe she wants one to pick her up.
It's understandable to want to do something for your partner, but you should get their permission before doing so in some cases. She might be upset if she feels as if you're forcing her into something. Try asking her first and discussing your view in order to attempt to get her to understand.
I'm probably just going to call one for her
You might want to take into consideration if she actually wants an uber. If not you may be wasting the uber driver's time and gas. You may have to pay them for their time spent even if she doesn't take the uber.