Should I get my chair a card/small going away gift although she has never been there for me?
I understand your frustration but let me explain a supervisor’s point of view. It is your research, your examination, not mine and you are probably doing fine! I would break in only if I would detect problems. 

My university, officially gives me 10 hours for supervising a master thesis student. I have 5 master thesis students under my supervision, I teach, I have piles of examination work, I have students approaching me with all kinds of request (assisting in finding internships). The other part is my own PhD research, publishing and reviewing. All part-time. I also have a regular and demanding job outside the university.

Your supervisor is just extremely busy. I agree with you that your supervisor should follow-up promises or not raise expectations. I suspect her intentions are well meant but reallity and work pressure catch up with her. 

My advise would be to have an open conversation with her to share your disappointment. But also be open for getting feedback because everybody has blind spots. The ideal supervisor doesn’t exist, the ideal student neither. If it still doesn’t work out between the two of you, you could consider changing supervisors.  

Good luck with your thesis. I am convinced you will be graduated in a few months ;-)