In another timeline [OLD]

Ivy was living the most generic teenage live.
Going to highschool, being annoyed by her little brother and having no idea what to do with her life. That was until one day a letter arrived at her house.
A letter directed at someone who didn't live there.
Upon finding out she's adopted and had inherited a freaking mansion, Ivy travelled over to the US to look at her newly owned residence. After looking around the (almost ancient) mansion and entering a mysterious door Ivy found hersef far in the past.
It all seemed magical until she was spotted by the family living in the mansion over 70 years ago.