My dog is named Ilsa!
My name is Rebecca. I am a veterinarian, and will do my best to help.
If you look at her gums, are they pink in color?
If so, she has good circulation, hydration, and probably good blood pressure.
The things that can make a dog go suddenly lifeless are heat stroke, heart problems, low blood sugar, fever, and electrolyte imbalances ( such as low sodium or potassium).
If I were able to examine her, I would check her gum color, feel the strength of her pulses, listen to her heart, test her reflexes, and take her rectal temperature (normal is between 101 and 102).
I am not seeing any responses from you. I hope you can see what I am writing.
I can try to connect with you another way, if I do not hear from you soon.