I think this is good. This will teach her three things.
Firstly, she will be patient just like you have said. She will be able to wait till the time she knows that her monthly allowance will come in. It will help her when she grows up because she may eventually get a job that pays monthly so she will be used to it and know how to spend her money that one won’t finish before she gets the other.

Secondly, if she gets it everyday, she will want to buy things that are not really relevant with it but if it is monthly, it is possible for her to at least list all of the things she wants and buy them if they are relevant.

Lastly, she will be able to save. Getting money everyday or weekly may not allow some people to be able to save. They believe another money will come soon so it is always better monthly and you will be able to save especially when you are dedicated to