Wilting New Guinea Impatien

I bought a beautiful pink New Guinea Impatiens approx 2 weeks ago, and potted it in a terra cotta pot the next day. We had 2 really hot days (mid-upper 90's); it looked really wilty after the first day. I watered it well and brought it inside. It perked up the next day, looked fine for 2 or 3 days; now it's wilted again; doesn't look good. It was sitting on my deck on the north side in the shade of the deck from the apt above mine. I fertilized it twice; potted in drought resistant soil.