Sexual dominance tends to be something you either get off on...Or don't.

Your partner imho, doesn't know what she I truly asking.

A lot of those who claim to like a dominant partner, are occasionally just lazy, what I sometimes refer to as a "pseudo submissive."

A good partner/lover, who requires something particular from their SO. Need not only to explain clearly, but provide a safe environment with clear boundaries to explore in.

It sounds like she has read 50shades of grey (God I hate that book, and all its erroneous information about bdsm.) and fancies her a submissive.
Thing is like a good submissive, a good dominant/ 'Dom' needs taught and to learn.

The absolute first rule in any endeavor like this is communication. Especially as she has BDP.
You cannot risk triggering her in someway because she can't be bothered. It's unfair to put you in that situation,and surprisingly careless on her part.

It's not surprising your uncomfortable and possibly insecure as it's in clear what exactly she is wanting.

Dominance means different things to different people. Does she mean unimpressive and forceful. Aggressive and loud. Angry, cold.
Calm and reserved.
Violent.
Not violent.
Where are her boundaries. What are her no go's.

Imo, if you can't get more specifics of her expectations, tread carefully.

Maybe a discussion outside the bedroom might help.
All the best.
Most of all....be safe. Do not do Anything you just aren't comfortable with.