Is it normal to be mad at my friend for not wanting to help me out?

So I was kind of in a tough situation with rent. so I applied for a loan and since I have no credit, the bank said they would give me a loan right away (I was asking $1000) only if I had co-signer. I went to my best friend to see if she would help me out in my time of need. I never ask for anything but rent was due and money is tight, my rent is under $600. Basically she said no, and its nothing personal. okay, I get the fact that one would consider it "risky" but in a month or 2, I know for a face I'm about to get a lump sum of money and the loan will be paid in full by then. As of now, i have the rent situation under control, but I'm still feeling some type of way about it. I just feel like being my best friend and knowing my situation and being able to help me, she could have did me a favor like this. Knowing the type of person she is and our past altercations, this feels like the final straw for me and it's making me not even want to be friends with her anymore. how can you call me your "best friend" but just write me off like that? is it normal to be mad at her and would I be wrong to cut her off for good?