I'm sure that you're normally a good student. Everyone gets a poor grade now and then. Stick with it; that degree will be important in your life.
Tell your mom that you messed up. Ask her to lend you the money and that you'll pay it back in installments (payments). Then get a part-time job--if you don't already have one--and do it!
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My thought exactly! Ask your mom for a loan.
Most things in life don't go smoothly. Obstacles suck, but getting past them builds confidence and sense of accomplishment. It sounds like you care about school- if you ask for a loan your mom will see that it matters to you. Good luck!