help!

[lastimestanding]

i am trying to think of a book i read a long time ago. i hope one of you can help! it was like...a girl lived in the 1800s but it turned out to be a simulation where people can come look at them. she escapes to get help because people are getting sick...or something...
any ideas?

edit- i found it! running out of time by margaret peterson haddix

nevermind!