Enrollment in Douglas County public schools has suffered another major blow. What school district officials had hoped was a sign of stabilization last year, a minor 1.1 percent dip, gave way this year to a loss of 151 students - a 2.4 percent slide."There is no guarantee when it will level off or bounce back up," said Superintendent Lisa Noonan. "We've had eight straight years in Douglas County of declining enrollment. We thought we hit that level-off mark last fall, so we're sad to see this. Because new people are moving in, but, clearly, we have other people moving out. …