This one is a 'tough' one for a generic response because frankly, it's so rare to see a girl open you up like that. Without looking at this girls profile and going off of one message, to me it seems like there are two likely scenrios:

1. She is very knowledgeable about BDSM and knows what she wants. Her question is one of the first ways she is screening you to see if you would be a good match in her eyes.

Therefore, what you have to do is use her profile, pictures, and overall vibe to craft a response that would reassure her. For example, if she seems very sub (most likely the case statistically speaking) you could go with something like "I like to take charge and dominate a girl in most aspects of sex" - That would be a decent, general answer that can help you dive deeper into what SHE is looking for. More to that, you can ask her a question to get her to invest and also just to get a feel for what she's looking for. That question might be "Do you have experience with BDSM?"

2. (LESS LIKELY) She is looking for someone to introduce her to the world of BDSM and is using Tinder to do so. I would follow the same thing I said earlier of judging her overall vibe before crafting a response but I would go with something similar here like "Taking charge and dominating a girl, do you have experience?"

Honestly, as I'm writing this I'm realizing that the response for both scenarios are in fact extremely similar lol so I guess you would just have to make an educated guess as to what she is looking for and steer it in that direction. Obviously, calibrate if she says something like "I'm very serious about BDSM, I've done it a lot, etc., etc." or "I've never done it before"

Anyway, this is honestly a really good sign and could lead to something really cool because like I mentioned earlier it is extremely rare a woman is so open to not only ask you that but also open you first and have that as a beginning question.

Hope this helps bro and lmk how it goes!!

"Spanking, bondage, hair pulling, light choking. With the right girl"