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First step is going to annualcreditreport.com and getting a copy of her free reports.
After getting them, reviewing to find the negative items and see if there are any errors. My score was that low 18 months ago and I had plenty of collections and Charge offs. At one point I had 8 collections on my account. Killed it.
With that review, you can start to work on improvment.
She has done that but the creditor keep selling her accounts.