Answer:
1. She lost the necklace
2. She bought a new one, replacing her lost borrowed jewelry.
Step-by-step explanation:
if you are asking in what did she do, She lost the necklace that her friend madam Forestier lend her.
And if you are asking in what did she do about it, they searched for it, but did not found it. After five years, she declared to buy a new necklace that is an exact replica of it.
And by the form of payment of selling herself and going into debt after ten years, Not knowing that the thirty-six thousand franc jewelry that they've replaced was only a fake one which was worth five hundred francs.