應該跟傳染沒關係。她有沒有吃抗生素？血糖好嗎？最近會不會過於勞累壓力大？

Several factors can cause a yeast infection, including:

• antibiotics, which decrease the amount of Lactobacillus (“good bacteria”) in the vagina.
• pregnancy.
• uncontrolled diabetes.
• weak immune system.
• poor eating habits, including a lot of sugary foods.
• hormonal imbalance near your menstrual cycle.
• stress.
• lack of sleep.