+1 to what IDCrewDawg said. Despite what you read in a lot of erotica, I don't think you can "make" someone into a top or bottom, if those personality trations are not already there.

If she is a Top, then she will work it out. Depending on her upbringing, she may have some mental barriers to the idea of a dominant woman, or D/s in general. These are things you'll need to work through together.

It's a journey, and it's not for everyone. But for those that choose it(or it chooses you), it can be very rewarding.