That is really difficult. How long have you been with her?
Are you able to find another therapist? Maybe through another organization or one with a sliding scale if you need?
For the ending, can you maybe ask her for something, a transitional object, to remember her by? It could be as small as a note to you on a piece of paper. That's all my pdoc was able to do for me and I cherish it. Also, maybe you could discuss with her your achievements, what you're greatful for, where to go next (referrals), etc.