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Hello, I'm Dr. Deb and will do my best to help you today.
I'm sorry for this concern about Charlee.
If the hair developer contained peroxide (which many of them do), then I'm not surprised that she may have vomited since we often suggest that peroxide be given to dogs if we want them to vomit.
If she only ingested a relatively small amount, then I wouldn't expect any other significant reactions to develop.
Since she may be nauseous for a little while longer, I wouldn't feed her for 3-4 more hours; then I might offer her a small amount of boiled chicken and rice which should be bland enough that it won't trigger more vomiting.
She should be fine but on the off chance that this particular product contained ingredients which might trigger reactions, a vet visit might be prudent if she continues to vomit and/or develops other signs such as trembling or lethargy....which isn't likely, to be honest.
I hope this helps. Deb