3rd day of nap and 4th night of bedtime..

Well Sunday april 19th, was the first night Izabella slept in her toddler bed and it was not so easy. Not that she got out of bed, because she didnt, but because she screamed and screamed as if someone was killing her. I believe she was scared cause she kept looking and point to where the crib rail would be and said all gone. I would go in there every ten minutes and until she finally gave in. The nights follow have gotten easier and I believe we are almost to the point that she wont cry anymore when we put her to bed.
Now naptime seems to be much easier and I dont know why but it is. She still crys but not as long or as hard.
Another issue we are having with her, is her biting out of anger, and I am getting tired of it, I have tried everything that I did with nathan and nothing is working. My SIL, Jill, told me something called the sassy spray, which I am going to try because I am desperate to try anything. But if you have any advises please tell me because I am willing to try anything.