All praise is due to Allah, and may peace and blessings be upon the Messenger of Allah.
It is not possible to conclude that the girl is affected by witchcraft based on these symptoms alone. It is also incorrect to accuse a particular person of practicing witchcraft merely because of suspicion or the girl's behavior.
What she is experiencing may be a psychological illness that requires specialized treatment. Severe isolation, loss of the desire to live, changes in sleeping and eating habits, feeling that Allah hates her, and suicidal thoughts are all warning signs that require urgent attention.
Her situation should be addressed as follows:
1. Seek medical help: She should be seen by a psychiatrist as soon as possible. Do not rely solely on ruqyah or assume that witchcraft is the cause.
2. Treat her gently: Avoid blaming her, pressuring her, or forcing her to undergo ruqyah. Speak to her patiently and provide emotional support.
3. Do not leave her isolated: Gradually help her reconnect with people she trusts and support her without making her feel guilty or inadequate.
4. Islamic ruqyah: Ruqyah and supplications may be offered gently, without assuming that her symptoms prove she is affected by witchcraft and without neglecting medical treatment.
Important warning: Because the girl is thinking about suicide, she should not be left alone if there is an immediate risk. Any means she might use to harm herself should be removed. If she has a specific intention or a near-term plan to commit suicide, she must be taken immediately to the nearest emergency department.
Her family should also remain patient, pray for her, take all legitimate steps to help her, and never lose hope that her condition can improve.
And Allah knows best.