Indeed, a nice Lauxaniidae, but a female making identification very difficult. Two genera are possible which have superficially the same characters, in particular the 2-3 pairs of black spots on the last abdominal tergites: Sapromyzsosoma (quadripunctata, quadricincta) and Sapromyza (opaca, sexpunctata and zetterstedti). Based on the photo I can only recognize 2 rows of acrostichal setulae, yellow antennae and palpus. Only one species fulfils these requirements: Sapromyzosoma quadripunctata. Moreover, the thorax is mat (not shining, excluding sexpunctata). I have never seen zetterstedti with more than 2 pairs of abdominal spots, excluding this species; quadricincta and opaca have 4 rows of acrostichal setulae.
That is all what I can say. In Lauxaniidae it is often impossible to make a safe identification if you do not see the specimen under the microscope, and often the genitalia need to be checked. The next time you have to catch the specimen!