If she's still in grad school, it will be a while before she makes $300,000. In fact, I don't know many young doctors who make that kind of money besides surgeons.
She is probably going to eventually become more annoyed by your lack of maturity than your lack of income, but for now, she is probably just wanting to have a break from her difficult field. Doctors tend to not be the most exciting people to be around, and you may just represent a break from the seriousness of her profession.
Relax... I'll need some information first. Just the basic facts - can you show me where it hurts?