I'm irritated talking to my gf right now
Is there a reason that she's irritating you?
Yes, because she doesn't stop asking me for more money.
I understand how that would be annoying. You should talk to her and tell her why that is irritating to you.
I just don't understand why she keeps asking for it.
I agree, she shouldn't be doing it at all. That's why you need to talk to her and tell her that she needs to stop asking for money and make some on her own.