What does it mean when you see grey spots???

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Sooo this is my sisters first pregnancy and she’s near to the end. No one will tell her anything. She has been battling with high blood pressure for the last month or two. The doctors took precaution because they thought she could be developing preeclampsia. And they later found out that she doesn’t have it 🙌🏽. Throughout her pregnancy she has been vomiting. But, today when she threw up she said she sees grey spots. Can someone tell me what this means???

Update: Thank you guys so much for the quick response. So the in call doctor came and checked her and she is 2cm dilated👏🏽 and she did a membrane sweep which she said could speed up her labor process. Her urine has blood and protein in it. The blood is from her being dilated. The on call doctor called her regular doctor to see if she was ok with inducing her because she is 37+3 but her regular doctor said no. She has to do the blood test that was ordered and if the results are fine they will send her home if not they will induce her. Also, the on call doctor said she may do a membrane sweep again to help with bringing on labor🤞🏽so fingers crossed that everything is ok. We just want her to be here already!