PoppyPuppy

My little Poppy is 8 weeks old & up until 3 hours ago was a healthy pup.

I was playing outside with her in the back garden, getting her to run about to tire her out. When we came in, she laid down & started to sleep, she then started to drool excessively & then coughing as if something was stuck in her throat, she's been sick 3 times & was foaming at the mouth a bit after the second time she was sick.
She also has very runny poops.
She's laid on my knee now & I am soaked from her drool.

I've called the vets & have an appointment for tomorrow morning but I'm really concerned.
She's still playful & seems lively.
The vet said it could be kennel cough.
Poppy has only just had her first vaccination & I read kennel cough can be fatal to dogs that aren't fully vaccinated, does anyone know if this is true?

Is there anything I can do for her overnight??