Yaris doesn’t start anymore

Hello together, I’ve been looking everywhere and googled, but found nothing. At least not with this problem: My mother had driven with my Toyota Yaris (BJ 2008) to the doctor. Everything great. Now she wanted to drive back, but my car didn’t start. He didn’t say anything either, so even the starter didn’t jump. Nix. No sound. Now she took the bus… I had the problem before, but after I left the clutch and then again I actually thought it was just something because of the cold. But now it’s not so cold. Maybe someone has an idea what that could be? Otherwise, fortunately, I have an appointment with Toyota for inspection on Thursday, but first of all the question is whether I can get it at all (then they have to get it) or whether the mistake occurs with them at all and they would do something if they didn’t notice anything… -.- Thanks already in the Get ready for your answers!