Do girls get hot flashes when they're turned on or horny?

Well.... When a woman is feeling sexually excited there can be an ^ in blood pressure, heart rate & respiratory rate. A woman may become flushed which can start with breast area & spread out (possibly throughout the body). This is caused by something called “vasocongestion”. Increased sweating may occur. I am not an expert in female medicine - just a psychiatrist.
Not menopause. Best to consult one of the experts in female sexuality here on healthtap. For example dr hedi fowler, dr pamela pappas, dr jeff livington, dr pierrette poinsett and their are many more very good qualified experts. You could type in female sexuality or female sexual response or endocrinology and several names will come up for you to chose from.