Debt consolidation may be an option to reduce interest rates, but it won’t help the problem as you’ve described it as you have an income problem. Shuffling the debt cards won’t make it go away.
What are your job prospects? Anything you can sell to raise money quickly? Was your sister an authorized user? If not, her purchases were theft and the transactions can be reversed (but you’d have to file a police report, which you may not want to do).
Best of luck.