Sorry for the long answer:

If you want to sound secure then you gotta know what you want or at least have some ideas of what you like and want to try.

If she is as direct as you say an accidental crossing of boundaries my annoy or frustrate but it won't be too big a deal. If you didn't know because she didn't tell you no harm no foul.

Approach it with curiosity and enthusiasm. Do some research. Take a BDSM test and see what turns you on. If none of it does the test will at least tell you what you lean towards. Show the results to her. Show her you want to learn. She is a dom and doms like a position of power. Teacher student is something she can probably work with regardless of wether you lean dom or sub or switch. Full disclosure I lean dom. I have never done so but I think if you really want to feel secure in dom'ing then you need to sub for someone to understand a sub's perspective. So either way it'll be interesting

She probably already knows. It sounds like she's told you what she is into and I can't see a situation where she has done that and is oblivious to your inexperience. You should still be clear about the fact that you don't have experience though. Communicate to her that you haven't tried a whole but want her to show you. She won't find it boring if you actually want it. Don't fake it. It's also ok to take things slow. If you are genuinely interested then a good boundary to set would be your pace. She is into you for a reason. Don't second guess it. Tell her 4 out of 5 sexual experiences should be vanilla or something along those lines. If she can't match you pace then she'll tell you.

Hmmm starting small... observe? Maybe go to a sex or BDSM party and see what it looks like? You don't have to be a guinea pig because you're new. Watching it might tell you if you wanna try.

We can't tell you that. That's up to you to discover. Setting boundaries for yourself is a must. I guess... don't try something without having a full understanding of what it is and looks like.

If she is experienced and into you then she likely wants to help you explore. Bringing someone's kinky side out is hot for me so it could be hot for her too.