@singlesucks13,
Aggressive panhandlers are a problem and at times have been known to take verbal aggression across the line to physical. I do not have a great deal of sympathy towards those who approach and ask for money, and the ones who approach cars bug me even more. They get the driver when the driver has nowhere to escape, they're stuck dealing with the panhandler's demand for money. It's also amazing that more of them haven't been hit and run over by vehicles.
The wanting to buy their own food is understandable, we just about all want to make our own selection. As to the $10.00, it clearly would take care of her food, used properly, she could eat for an entire day....maybe through tomorrow if there were two for one deals. Sure she wants more money, she may be thinking long term. You don't know her entire situation. She may be unemployed and needs to come up with rent money, maybe she has a sick parent or partner who she is trying to help. Maybe she has a child. Talk to her, find out.
I have always talked to the panhandlers. They are people and in many cases have ended up homeless, out of work and in need. Not all of them use the dollars for drugs, alcohol, cigarettes or sex. Those who do, don't get money from me. If all they want is food, I have often taken them to a store and buy what they want, even give the leftover change to them. I'm not wealthy so I have learned to be selective.