Hello,
Pregnancy does make the gums and tooth more sensitive especially in first trimester. The unfortunate thing is we cannot take xray or do most of the procedure in first trimester.
Next Steps
But I will advise her to visit the nearest dentist soon and she will be fine with some pharmacological management. (Medicines prescribed). She can get the procedures done in her second trimester if urgent.
Health Tips
The oral hygiene has to be taken a special care during pregnancy. Brushing, rinsing and flossing should be on point.