Lewis was notin the right frame of mind to continue.
刘易斯当时心情不佳，不适合继续下去。
《柯林斯英汉双解大词典》
2
I cannot explain it, because she does not seem in her rightmind at times.
我无法解释，因为她有时似乎精神不正常。
3
(even in cases of suicide, often the deceased person, was notin their right frame of mind) finding the good that can come out of the pain of loss, finding comfort and healing.