Domination advice

Domination isn't just about tying someone up. Some ideas;

Have her kneel on the floor and beg to suck you.

Have her perform tasks for you on a regular basis- e.g. write a story of her deepest fantasy, orgasm denial.

Have her wear a submissive collar

In doggy style - grab a handful of hair and praise her.

Instruct her to do things to you or impose a rule she must obide by

None of these need be rough-handeling. Just domineering.