Behind in payments, but with equity

[M A.]

A seller contacted me yesterday with the following problem:

She owns a property that is worth 170K
Her remaining mortgage balance is 100K
She is 5 months behind in payments.

She wants to sell, but doesn't want to lose all her equity.

I normally only do short sales, I dont really know how to proceed with this one. How can I help the seller and still make a profit. Advise needed!

Thanks in advance!