I was just telling someone about this same thing the other day. Tell her to ask about seeing an Ear, Nose and Throat doc as she may have vocal cord dysfunction. It causes the vocal cords to just slam shut with the slightest provocation. I can get it breathing but more likely with soft foods like soup and pudding and even talking. All of a sudden you can't get air in or out unless you suck in really hard or cough with extreme force to get it past the vocal cords. I sometimes start turning blue before I can get them to relax enough. You feel like you're choking to death.
I use cold drinks sometimes and hot other times. Whatever is easiest at hand ....just give me a drink! Swallowing is the only thing that gets the vocal cords to open up. But the intense coughing/choking can inflame the whole throat and make it so you get more of them until the inflammation goes down. I just had an attack yesterday and I'm fighting to keep my throat soothed today. Lozenges with a numbing agent in them helps.
So please, if these symptoms fit, have her checked by an ENT doc or a lung specialist. It's scary but treatable.
good luck................Jenny