I would probably go the positive reinforcement route. Talk up whatever reward you're prepared to offer and remind her at bedtime what fabulous surprise will be waiting when she wakes up in her own bed (not having come into yours). My daughter was definitely motivated this way at her age and it was much more pleasant to remind her (and nicely say "I'm sorry, but you didn't earn the reward; maybe you'll earn it tonight" when she didn't) of what's waiting for her with success. Also I think it's less confusing to her to have a reward waiting for good behavior since you already permitted it without objection earlier (and for good reason).
At 2 1/2 my daughter was highly motivated by sticker charts and we got a lot of good habits established using them. I wish you luck.
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