My fears and resentment about my supervisor
Many supervisors do not help their PhD students (I do not have statistics, obviously, but experience from different universities and research areas). These students often feel lost and also unsure about their PhD thesis. At least in Germany it is not uncommon that PhD students who have these kinds of supervisors drop out or take exceptionally long for their PhD.

I think the best you can do in such a situation is to get help from other sides (often difficult), and if this does not work out you should finish as quick (and as good) as possible and leave that particular environment.

It is unlikely that you'll fail if you submitted a proper PhD thesis. It is also unlikely that your supervisor will directly use your data or results if she is not really involved in your research. She might give them to the next PhD student, but you (as a postdoc) will probably be much more experienced so that it is unlikely that this PhD student publishes something you also tried to do.

So, I would not worry too much but look for a better place for your future research.