What is the procedure to get money from my step-daughter who refuses?
A conversation with her bio parent (your husband/wife) as to what the expectations are for step daughter. If he/she agrees that the step daughter should be paying her share, then have her parent set down the rules, tell her the expectation and what the consequence are for not following the plan. I dont think its ever appropriate for a step parent to be the one to bring up such things with their step child because presumably, they have a bio parent that youre married to/living with who should be doing this type of parenting.