Sorry that you are feeling so low, Cuppa. I don't think that the counsellor will ditch you, as you fear. If she identifies that she can't help you/is out of her depth then she will be able to refer you onto another colleague with more experience. Alternatively she may find that, once she has met with her supervisor, she can take a different approach with you, and that she gets more support in working with you.
However, it will be up to you to decide whether she is able to hear what you are telling her, and whether she is able to move at a pace which is appropriate for you. You will need to give her the feedback on how useful the sessions are, or not. And sometimes, it is important to try different counsellors before you find the one that is right for you.
It can be frustrating having to move slowly, and make changes but on the other hand you have started out on a road which could be a fantastically important journey for you, into a new future.
In the meantime, you know that rape crisis will offer counselling and support which is very relevant to you, if they have someone suitably local to you. One of the posters below also suggested some online support groups and books too - you aren't alone, Sweetheart, there are others who do understand what you are going through and who can help you take the next steps forwards.