The salaries of teachers majoring in western languages in Jida and Overseas Chinese Foreign Affairs College are unknown, but they are estimated to be at least equal to those of foreign English teachers, because the students majoring in western languages in these two schools are particularly in demand, and the treatment of teachers will not be too bad. Moreover, teachers have enough time to work part-time, because I have also participated in off-campus training, so I know that Spanish teachers in training institutions are well paid.
It seems that as long as the mother tongue is what the school needs, the character is correct and there is no criminal record. Your friend is China's teacher, and he is more popular.
I hope she will come to Changchun to teach, because two universities offer Spanish majors (about 28 schools in China offer Spanish). Moreover, many foreign teachers in Changchun have stayed in Northeast Normal University and Jilin University to study Chinese and have strong Chinese trainers.
I sincerely hope that your friends can come to Changchun.