3 y/o vomiting every 30m since 5am (8h)

My 3 year old woke at 5am vomiting. She’s been vomiting every 30 minutes (or less) since. It’s 1pm (8 hours later) and she last vomited at 12:40 so we are still trending 30m. She is taking sips of water in between throwing up but naturally there’s hardly anything left and she’s mostly gagging / throwing up bile. I’ve read several stories of this happening and it being viral/ the child being fine just having to run its course. Some people saying go to the ER, some saying just keep trying oral rehydration. She had a wet pull-up this morning when I took it off 7am, but hasn’t peed since. She cries every time she throws up and still has tears. She is denying stomach pain and doesn’t flinch at all when I push on all quadrants. My concern with taking her to the ER is picking up something there, traumatizing her (she’s very sensitive) but obviously know that if it’s something serious it’s more important to take her. There’s a snow storm that just started adding to my decision making urgency. I have a 1.5 year old home as well with (thankfully) no symptoms. Anyone have similar stories of their toddler throwing up this often for this long? Tips and tricks? Words of encouragement? Thankful that this is our first time dealing with this in 3 years, and it could be much worse, but still so worried.