Rachel is considered one of Jewish mothers and known in her holiness. Why did she cooperate with Lea and gave her the signs without informing Jacob. Moreover, she knew how eager (spiritually) Jacob to marry her. She knew how much time he worked for her. So how come that she practically did such a did. In addition, it is considered as a mercy. When she asks mercy for Israel nation she reminds G-d this? Isn't it cruel to do such a thing for Jacob?