Any process involved in the maturation of a precursor Small SubUnit (SSU) ribosomal RNA (rRNA) molecule into a mature SSU-rRNA molecule from the pre-rRNA molecule originally produced as a tetracistronic rRNA transcript that contains the Small Subunit (SSU) rRNA, 5.8 S rRNA, 2S rRNA, and Large Subunit (LSU) in that order from 5' to 3' along the primary transcript.