Attachment Therapy/ Nap Hurdles in School?

We would really love to keep her in pre-school versus a nanny or daycare environment, but we are willing to consider other options if it's the best thing for her. We want to make sure that we're not jumping the gun! We were surprised as well that there are no other options, although we understand the reasoning behind it. We were also told that it was an issue with staffing, as the teachers rotate their lunch breaks around nap times.