In one sense, all of Laura's "choices" are made by her mother. More specifically, however, Amanda uses Laura's fragility to reconstruct her own youth, which went poorly, so now Amanda exaggerates and bends the truth to turn Laura into her "second chance". Peripherally, we can point to enrolling Laura into secretarial school as a typical manipulation, with Laura pretending to practice her typing but really polishing her glass collection. Amanda won't let Laura call herself crippled. She also makes Laura go to the store, where she has to ask for credit, even though she knows Amanda cannot pay. Finally, the entire scene with Jim O'Connor is constructed by Williams to show Amanda working the situation with Laura around to the ideal her mother has created in her imagination.