Hi, I've been searching and trying to find clarification on travel in the Schengen area. Our daughter will be doing a study abroad in four countries in the Schengen area this winter. She departs here 1/1/20 and will be there pretty close to the 90 days. We had been previously planning a summer vacation to Italy before the study abroad opportunity came up. I'm now trying to plan dates for our summer trip and when it would be ok for my daughter to reenter that area. I know it's 90 days for every 180 days. I found this on the travel.state.gov website. "Spend three months in the Schengen area during any six-month period, you must wait another three months from the last date of departure from the Schengen area before you can apply to enter the Schengen area again without a visa."
To clarify does she need to wait 6 months from her arrival of 1/1 or 3 months from her departure date for the 90 days to restart? I was thinking that leaving no earlier than July 2 would be safe or should I be counting out 180 days instead? We are just in the beginning stages of planning the trip and I want to be sure I don't make any mistakes with the dates of travel so that she can go with us. Our trip will only be around 2 weeks.