I was in a lot of debt a few years ago, which all came to a head when the bank refused to transfer my rent (I'd maxed out my overdraft limit and my credit card).
I went and talked to the bank, got it all converted to a bank loan, and paid them off month by month. They sat down with me and worked out all my income and outgoings etc, and we figured out how much I could realistically afford to pay back per month. They were really good (it was Citibank).
It took me just over two years, and it was an immense relief to get rid of it.
I really think this is the best way, I would definitely recommend it.
As Monkstown says, the best bet is to couple it with a lifestyle change.
I could have taken longer to pay it off, but the rent thingy got me really scared, so for the two years I hardly went out at all. We used to invite friends over for meals, and friends would invite us over. No holidays, living on the basics, that kind of thing. But if you say that the debt is not too bad then you probably wouldn't have to be quite so drastic. Lucky for her that she has you to support her through it