Yes I would certainly share my concerns !

Yes 100% express your concern.

Yes, rashes can turn nasty very quickly. And if in doubt call the parents and then nurse on call etc, if you are unable to get onto the parents

Hoping you did call and everything was fine. But yes. I’d always call them. Better safe than sorry.

If you ever notice anything out of the ordinary, especially when it’s someone elses child you should always mention it to the parents just to be safe

What was the outcome I am wondering?
Hopefully you contacted the parents at the time and they sought medical advice.

Whoa! A thousand percent call the parents and probably even call the ambulance to see if they need to be rushed to hospital as that doesn’t sound good at all.

You definitely should mention that to parents.

Yes I would contact the parents on any form of vomiting and describe what you have observed. Jelly like clear substance could be mucus

See a GP!

Yes, absolutely. I’ve never heard of a kid throwing up a jelly like substance. If it was your own kid, I”d be saying go to a doctor with some urgency.