You are doing it right so far. Some sativas take a long time to start showing signs of re-growth but most varieties will show signs of new growth in just a few days. I hope you flushed her after harvesting?
If you have the re-growing plant in a 3 gallon pot or bigger you should be OK. If you are in a smaller pot you may want to transplant to a bigger pot. That's a good time to flush if you haven't. Also, you should get in the habit of aerating your root system at least once a week. To me that means taking a 12-inch bamboo splinter and poking it down into the rootball. That allows more oxygen to get down where it is needed. I re-veg for 4 weeks as most indicas will be nice and bushy after 4 weeks. BONUS -- PLANTS TAKE LESS TIME TO FINISH SECOND TIME AROUND!!! If a plant took 6 weeks to finish the first time I will figure on it maturing in 4 1/2 to 5 weeks on a re-grow. BONUS II -- yield goes up second time around too!
Good luck, BigSteve.