Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services now if someone exposed to nail polish:
And for anyone, someone who:
Contact a poison centre promptly after more than a small taste, any intentional swallowing or inhalation, or an exposure involving an unknown amount.
Call even if symptoms have not started, because the product ingredients and circumstances affect what monitoring is needed.
Seek urgent medical advice if coughing, repeated vomiting, increasing sleepiness, eye pain, blurred vision, or persistent breathing symptoms develop.
Arrange routine medical or occupational health follow-up for symptoms that keep returning during nail product use, or for problems with memory, balance, sensation, mood, breathing, or skin over time.
The article also says
Do not leave an unconscious person alone.
Place them on their side if they are breathing and it is safe to do so.
Do not give anything by mouth.
Every sign above is quoted from the sofidex article on Nail polish poisoning. If you are not sure, err upward — it is always reasonable to be checked.