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First, she never helped me on either my thesis or my slide presentation.
After my presentation (which she did not attend), she asked me "how to present" it to her so she could use it in the international conference.
(I don't want to do that, but I have no choice.)

Then, she asked me to send the whole presentation.
I sent it to her as a PDF file.

Later, she asked me for the "power point presentation" with the script.

I really don't want to give it to her.

What should I do?

P.S. She never gives anybody credit. (She did this before with my senior.)

As an advisor, I regularly use my students’ slides when I present my current projects. This is usually done within the context of high level presentations: I’m working on important project X; Alice and I worked on X.a which resulted in such and such, and with Bob on X.b which resulted in so and so. Claire and I are working with Alice to extend to X.c. If your advisor is supportive and showcases your work, she’s increasing its visibility and helping your career.

To conclude, presenting students’ work is not necessarily a bad thing and can help them a lot.

What is more concerning is that you seem to have serious trust issues with your advisor. She may be passing off her students’ work as her own but I honestly think that this is either a misunderstanding or something else. Advisors normally want to show that their students are doing well, not that they’re being totally shepherded by the advisor. This reflects badly on the advisor which is why I think it’s unusual.

If things have gotten to the point where you’re not harboring any goodwill to her, I suggest you rethink your options. If there’s a chance of a conversation to rebuild trust, try and have one.

It's pretty common in my experience for advisors to present their students' work, with acknowledgement of the students' contributions. They'll often combine slides from several students' presentations into one talk for a conference, but they can also present just one student's work. In that case they usually say something like "The work I am going to talk about today was all/mostly done by my student, Whoever McLearny", at the start of the presentation.

Prepare a version of the slides specifically for your advisor to present, with her as the presenter, and with whatever acknowledgement of your authorship you feel is appropriate. This could be as simple as the first slide having you as the first author and your advisor as the last author, with your advisor's name somehow highlighted to indicate that she is the speaker. Or it could be having your name and picture featured prominently on an acknowledgements slide at the end of the presentation, along with any other group members who contributed. Or it could be your name in the corner of all the important figure slides, to show you did that work in particular, if the slides are going into a longer presentation.

Then you can send your advisor a nice pre-made presentation, and she won't have to do any extra work to cite you, because it will have already been done. It also communicates what form of acknowledgement you feel is appropriate.

On the other hand, if you think you and your advisor have very different ideas about how much or what form of credit is appropriate in the presentation for your contribution to the work, you need to have a talk with your advisor about it.

One benefit of her giving your presentation is that she will be actively promoting your work. For example, my adviser presented my theoretical work 3 times at 3 different conferences, and found an experimental collaborator to show that my theories were correct.

The more exposure your research gets, the higher the possibility for citations, which then leads to better career opportunities.

If you have to give it to her, then give it as an executable not the slides...

That way she cannot remove your name or change the order of the slides... so it stays as you would present it yourself.

You should speak to someone above her to make the situation clear.