(Warning! For those who have not seen or just starting to what steven universe this will contain spoilers. So be prepared.)
All this take place after the event where steven and the crystal gems escape from peridots ship and lapis lazuli doing fusion with jasper along with paridots escape. After that it has been 3 weeks but during that time the crystal gems don't know that jasper has managed to unfuse with lapis and escape and lapis is currently afraid and ashamed to show herself to the crystal gems.