I will give you my opinion on the safest, easiest way to brumate your dragon, though it sounds like it's quite possible that your dragon wasn't actually trying to brumate at all, she was just going through a normal, winter slow-down period that a lot of them do, where they become a bit more lethargic than usual and eat less than usual. So it's quite possible that by turning off her UVB tube and Basking Bulb, and removing all of the heat, you actually put her into a partial brumation that wasn't necessary. Many Bearded Dragons in captivity do not EVER brumate. My first dragon was a male that I brought home when he was around 2 months old, and he lived to be just shy of 13 years old, and he never once brumated, not even a partial brumation. He did however usually slow-down his appetite quite a bit from November through February (I live in central Pennsylvania, so it's very cold her, and they can sense the change in barometric pressure caused by winter, even if their actual temperatures don't drop). So unless your dragon starts to continually try to stay out of all light by constantly hiding inside a cave or hide all of a sudden, and is actually sleeping for very long periods, then she's probably not actually trying or wanting to brumate.
If your dragon does start trying to continually stay out of all light, starts sleeping all day long, and stops eating completely, then yes, she's probably wanting to brumate. In my opinion, the best way to do this is to leave her lights on as usual, don't change a thing about her daily photoperiod and leave both her UVb and her Basking Bulb on every day for at least 13-14 hours a day, as you normally do, but make sure that she has constant access to a hide/cave that she can get into/under fully on the Cool Side of her tank. If she's actually brumating she'll go in it, go to sleep, and stay there all week. But leave her lights on as normally, and turn them off at night, turn them on in the morning, like nothing has changed. Then pick a day of the week, like Sunday, where you take her out of the hide/cave and wake her up, and then give her a nice warm
bath and make sure that she drinks as much water as she wants to (usually they will drink the
bath water) or give her drops on her snout to lick off until she stops licking, BUT DO NOT GIVE HER ANY FOOD AT ALL! Then after her weekly
bath just put her back in her hide/cave. Wake her up once a week to give her the warm
bath and a drink, and eventually she'll start coming out in the daytime, and slowly she'll wake up.
Unless she's spending a good amount of time out under her lights as she's waking up, you cannot give her any food, as she will not digest it while sleeping in the hide/cave, and that's how a lot of terrible health issues happen, when food just sits in their GI tract and rots. Once she's up and on her basking spot/platform during the day, then you can start feeding her again, but introduce food to her slowly and in small quantities at first, until she's all the way out of the brumation...