Sleep schedule

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My baby girl will be turning 13 months in a week. For about 2 weeks now she has been dropping one of her naps. She used to have two naps, one around 11-1pm and the other around 4-6. The last two weeks she dropped her late nap and the first nap is around 12-3pm and goes to sleep for the night at 9 or 10 pm. I have tried to put her to sleep at her previous nap timings, but she refuses to sleep. Is this normal?