Why is my 4 year old vomiting?

Linda • Mama to two baby girls named Blayne and Blaire. 🌙🌟 Husband and I own an A/C business.❄️ Cat lover 😽 Florida 🏖

So Monday my daughter kept saying she had to throw up and such. Starting in the morning. Nothing happened till like 8pm and she dry heaved. I took her temp and it was a low grade. But she was also in long sleeves long pants and under a heavier blanket in Florida lol. After she dry heaved she was fine, eating cheez it’s and such. Went to bed and woke up fine.

Now today which is Friday she told me earlier in the day that she had to throw up. Again nothing came of it. Was acting normal all day. Then tonight around 7:30 she had a yogurt pouch then a veggie pouch and about 25 minutes later she was saying she didn’t feel good then not 5 minutes later she threw up. Then was fine for about 15 minutes then threw up again. Then fell asleep on the couch. And we put her to bed and she’s sleeping. No fever at all.

She doesn’t have the best diet I will say. Lots of popsicles, ice cream, crackers, stuff like that. She refuses veggies

Why has this happened twice in one week? On Monday her dr didn’t think it was a stomach bug. Do I have reason to believe it is now?

Also I have a 17 month old and I’m freaking out a bit. (But she also the morning after put her sisters sippy cup in her mouth and hasn’t gotten anything so far)