Therapists differ in their ideas about appropriate boundaries. Some would welcome the opportunity to mentor you a bit. Others would not. I cannot therefore answer your questions specifically.
What I can suggest is that an email is the least intrusive way to contact her. An email lets you be clear about your request and also gives the therapist the opportunity to think about how she wants to respond. (A phone call might catch her by surprise.) I have no idea whether she will respond. All you can do is give it a try and not take it personally if she does not contact you. Lack of response may only reflect her agency’s or her personal policy.
I wish you luck in pursuing psychology as a career. In my opinion, those who have used therapy well bring a unique gift to the profession. You know what it is like to suffer. And you know what it is like to heal. That can only serve you well as a therapist.
I wish you well.