What does it mean when a woman gets a lot of bacterial infections?

Hard to comment. To get the most from this site you need to provide background material on the issue and ask a related question.You have not provided an indication on whether these infections occur in one place or many, respond to treatment or not, started this month or over many years, we cannot be very specific. A general answer would be that she is doing something or has a weakness that allows these to occur.
Lousy immunity. By far the commonest cause is high calorie malnutrition, particularly the sweet stuff. You probably need supplements. See a nutritionist.