I am not a pediatric dentist, so sent or teeah22 might be better suited to answer.
The gray coloring is usually a sign that the nerve inside the teeth is dead. They may suggest a root canal or extraction based upon the other factors (tooth mobility, her age, etc.) that we cannot assess here. The fact that they were luxated (displaced, but not completely out of the mouth or avulsed) is a high risk for nerve damage. Did they splint the teeth together to address mobility? Do they still move when she eats? Do you think that they hurt her day-to-day?
What is scary to her about the dentist? It hurt last time? This is a big reason to find a dental home early, so that kiddos can have good dental experiences under their belt if/when they need care. We usually talk about counting the teeth. Ask her to guess how many teeth she has...kids will guess anywhere from 2 to 100 (and up!). There are 20 deciduous teeth, so you can practice counting them. You can talk about Mr. Thirsty (the saliva ejector) or the tickle toothbrush (the trophy cup), which may help as well. Caramini knows that I am a doctor who helps people when their teeth and gums hurt or are sick.
Canada may be very different, but in the US they would most likely do some kind of sedation/anesthesia for extractions on a 2-3 y.o.
Dr. Seuss has a tooth book. Also Doctor DeSoto is a funny book about a mouse dentist. There are probably more practical, this is what to expect books as well.