She was eight months pregnant when she was forced to leave her Denver homeless shelter. Ivanni Herrera took her 4-year-old son Dylan by the hand and led him into the chilly night, dragging a suitcase containing donated clothes and blankets she’d taken from the Microtel Inn & Suites. It was one of 10 hotels where Denver has housed more than 30,000 migrants, many of them Venezuelan, over the last two years.