She told me she liked me and now acts distant?

A couple of days ago I was chatting with a girl on fb that I met in person and have been talking to for a while. I decided to tell her that I really like her. Her response was "Awww :), well to be honest I like you too." Well the next day I called her and she didn't pick up then I texted her and she didn't reply. After a while she texted me saying "sorry, I haven't been ignoring you or anything, I have just been so stressed out because I am going through a lot." Well lately she has been distant and doesn't talk to me nearly as much as she used to before I told her that I like her.Did I do something wrong or do you think it's the stress that has her acting this way? It was immediately the next day after that she started acting like that. What should I do?
She told me she liked me and now acts distant?
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