can you leave institution on x2 visa early and travel in china for 2 weeks-is it legal

My friend is at University for three and a half months since 1st March on x2 type, a double entry one and does not like it and wants to leave the institution in ten days and then travel for 2 weeks within PRC with a friend and then come back to England ie end her contract early with the university as although she is on a student type she is actually not studying she is teaching English at the University.Is this legal or is it likely she will end up being arrested for terminating contract 6 weeks early -what should she do?how long after informing the uni that she is leaving does she have before she HAS to leave the country?please help really worried??