Sometimes things come around with time. I helped my sister out years ago. I was not in a great financial situation and I got into serious trouble with my then-husband for it. But I gave her the money anyway. It wasn't $4,000, but it was probably the equivalent, since I had nothing.
Some 20 years later, I'm in dire straits and I asked my sister for a loan. She immediately offered me $1,000 cash, no strings attached, and she persuaded my dad to also help me. So what goes around comes around. If you really need the money, be honest with her. If you can manage without it, maybe you can take the big picture perspective. Some things are more important than money.