This is a new and difficult situation for all of you, but especially for her.
She might be depressed, anxious, overwhelmed by her new life circumstances.
Is she attending a new school as well?
Can you offer her the opportunity to see a therapist to work through this transition with her?
Encourage her to join activities at school to make new friends, something she enjoys, sports, drama, music, debate, etc.
Approach test prep and college planning slowly. Her school might offer a SAT prep class. Or she can do some free practice tests from the Collegeboard website.
She can sign up for May or June and August SAT, giving her more time to adjust to her new life and school.
I would not send her away to camp unless she asks to go to one. I think more time with the family will help her to feel part of your family quicker.
In the spring you can tour a few colleges nearby. Public, private.
She doesn’t have to go to competitive schools. The goal is for her to be successful and get a degree, if that’s what she wants.
She doesn’t have to know what she wants to be yet.
Right now, something happened that pulled the rug out from under her, her life has drastically changed. Give her time to deal with this.