I'm thinking there's lot of wisdom in dhyanna's post.

Not everyone can switch.

If you want to have a D/s relationship with her,
and she needs you to be the dom, then be the dom.

Sometimes it helps to mentally prepare, but having certain key words, phrases or commands to put yourself and your sub in that role.

For example, my sub and I are great friends. Nat, is his sub name, but not his real name. If we both want to play, I might ask something like, "Is Nathaniel home? Does he want to come out to play? Is he willing to obey his Miss?"

If he answers, "yes", then I happily take the domme role.

Some people can switch with the same person, other's can't. You'll have to find out what works for the two of you.

Big hugs,

Ruby