A mother came up with an idea for a Shidduch. However it wasn’t the right time for the mother to start making the phone calls, offering the shidduch, working on it, etc. So she gave it to her daughter. In the end the daughter was able to make the Shidduch (everything was done through the daughter from start to finish.) Is the mother entitled to any money al pi din?
Although the original enactment of shadchanus payment was that a matchil (the person who initiates the shidduch) is only paid if he also arranges financial matters, and gets the sides together for a preliminary meeting, the custom today is that the person who comes up with the idea is considered the matchil, and receives a third of the payment (see Pischei Teshuvah, Choshen Mishpat end of 185, citing from Shev Yaakov Choshen Mishpat 13; Aruch Hashulchan; Betzeil Ha-Chochman 3:10).
Therefore, the regular custom will be that the mother will receive a third, and the daughter two thirds.
However, sometimes a mother “gives” the shidduch to her daughter, and if this was the intention, the daughter will receive the entire payment.