Suddenly Have Loose Skin Around Abdomen on Thin Person /never Obese?

I ' m a 44 yr old female, 128 lbs, 5'10 ,thin &toned. Over course of 5 wks developed a wobbly midsection- loose & jiggly. I do regular training & eat healthy. I've increased my ab training but all its doing is burning fat / leaving loose skin behind. My skin elasticity is good so its puzzling. Is there a chance the skin will "catch up" and shrink back? When? A plastic srgeon said its not an area for lipo since its skin. Which lasers /treatments tighten the area?

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