You can alter her mindset quite a bit with extremely mild tasks.

Position practice. The positions you choose don't matter as much as her state of mind. 1) Simple positions are great for meditating or for relaxing after a long day in the vanilla world.
2) Positions to display herself to her dominant... for inspection and idle play. Practicing the position alone, or under your supervision, knowing that it is so she can focus herself and be inspected by you (or potentially others) will also elevate her sense of submission.
3) Positions that offer her backside for punishment or to service you sexually create yet another mindset in her.
4) Positions of self bondage... making her grasp her ankles and not let go... making her grasp an overhang or the far edge of a table... all remind her of her bonds to you.

There are a number of threads here for which you can search.

I also suggest simple tasks.

A clothespin to be left on her desk while she works... to be seen in the top of her purse whereever she goes... to be worn dangling from a piece of clothing tapping her skin, or clipped to a boot top or laces... Always reminding her that even when you're not there... you are in her head.

That is how I start off new subs... In fact, that's how I start off experienced subs... so they think about me... and not about what they think they want.