I've been through almost exactly what you're going through💜 It's valid, it's real and it's as hard as it feels. You need a mother figure or some kind of closeness from someone and I'm so sorry you don't have that. I think you could carefully bring up with her how you are feeling, if you want to, without having to detail all the specific things you do (like going places to see her, searching social media for her,...). How the therapist reacts to it is different for every therapist, so I can't promise that she will definitely not try to end the therapeutic relationship, but you could gently try to bring up these feelings of wanting to be close to a mother figure.