Bisexuality Support Group
Bisexuality is a sexual orientation which refers to the aesthetic, romantic, and/or sexual attraction of individuals to other individuals of both their own and the opposite gender or sex. Most bisexuals are not equally attracted to men and women, and may even shift between states of finding either sex exclusively attractive over the course of time.
Some moms love to invade privacy because they see it as a form of caring, "I want to be sure my daughter is OK." It doesn't make it right but they don't see it as being the intrusive act you do. Ever since the invention of the scraped knee, moms have been great fixers of their children's problems. Since your mom might be kind of new to all this, she could be wondering just what if anything she needs to do about all this. She could have worries for herself too, like what if might mean for family reunions and grandkids.
It sounds though like your mom is having the hard time with your own discomfort and difficulty in talking freely. But in the end, it's your life and you're the one who gets to decide the whens the hows and the wheres.