Car died sitting in park

My sisters car died while it was in park, she said it started right up when she got in it, Then she went inside while it warmed up, when she came back out it was dead.

I told her that it was probably her alternator that drained the battery and the car and that’s why it’s ticking when you try to start it now

But can there be anything else that will kill a car while it’s sitting in park, if it started right up a few minutes earlier ?

Update: car was checked out and it’s not the battery or the alternator, theyre voth good, and the car has full power. a few other people checked it out and said it was the fuel pump so I checked the fuel pressure, and there’s no pressure at all, swapped out a fuel relay and swapped out a few fuses to the fuel pump and still nothing, I’m having a hard time thinking it’s the fuel pump because the fuel pump primes when the key is turned to on, so I did a OBD scan on it and it came up the MAF sensor but that’s probably because of no fuel right, so could it actually be the fuel pump or is the MAF keeping the fuel from pressurizing, even if the fuel pump is priming ? No fuel pressure. Fuel Hoses looked good under the vehicle

Another thing I find rather odd is that the autel OBD live data shows that the fuelsys1 to be reading — instead of OL or CL like it’s not getting a signal, but I can hear it hum for about 3 seconds, I’m trying to talk myself out of it being the fuel pump 🙂

Update: #2 So I removed the fuel tank and the fuel pump, I tested the tank weight, it was good, I tested the tank sensor, it was good and the other part had continuity that looked like a filler cup so I’m guessing it was good, but here’s a shocker. There was absolutely no fuel, nothing, nada, zilch, the gauge was reading 1/2 tank, which was odd, the next thing I found was that the fuel tank wiring harness for the fuel tank sensor, found one of the wires hanging on by a thread, so there was some sort of reverse effect I’m suspecting, now I just have to put it back together and hope, no gas and a bad wire was the issue.