| Can you help me find out what book this is?

Echo asked:

I read a book a few years ago and really loved it. It was about a girl who was adopted. When she was 17 she went searching for her biological mother. Her search leads her to the town where her mother was born and she finds the house her mother lived in. The girl reads a diary her mother wrote and finds out that her mother had gotten pregnant when she was really young. After staying in the town and living in a bed and breakfast for a while with a hospitable woman, the girl comes to the end of her search and finds out where her mother is. Living in a city ( Boston or New York) the girls mother is, with her children from a marriage. The girl is surprised to see how rich and snooty her mother is, and after lunch with her mother ( After her mother recommends she wear chunky jewlry instead of the little yellow butterfly she was currently wearing) the girl realises that she loves her adopted mother and happily goes back to live with her.

I know it sounds like a know a lot about the book for not being able to find it, but I just can’t.
Also, I believe the mothers name is Julie.
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Thanks so much!