Vaginal discharge is normal and people vary in the amounts of it. A normal vaginal discharge consists of about a teaspoon (4 ML) a day that is white or transparent, thick to thin, and odorless. This is formed by the normal bacteria and fluids the vaginal cells put off. The discharge may change throughout the month depending on ovulation, menstrual flow, sexual activity and birth control. When ovulating it tends to be thicker and more noticeable. Basically the body is "cleaning house" and keeping the vagina clean and healthy. There's a reason mini-pads are big sellers! I don't know what treatment your sister-in-law had. Perhaps she was having some abnormal bleeding.
It would be abnormal if you noticed a strong, unpleasant, even "fishy" odor, if it itches or you have pain with intercourse, etc. Those situations might require medical treatment.
The answers in online forums are for information only and are not intended to substitute for medical advice and care. Please see your personal health care provider for further evaluation of your individual case.
Debbie Miller, RN