I used LM with my 4 year old boy. He did benefit from it. He didn't much like it. We gave it up after about 45 days.
What he did get from it though was a more solid idea of what numbers are. He is now much clearer about how much bigger 10 is to 2 and can visualize a pile of 20 as compared to a pile of 5. It was worth it.
We stopped as he didn't want to do it, we now use rightstart math which he LOVES and he is learning very quickly from it.
So I would suggest you include your daughter in the beginning, let her be your guide as to when to stop and also start her on something else with a bit more content. She isn't going to learn subtilizing at age 4, but sh emay just get a better understanding of quantity from it.
Rad through the other math threads for ideas. Marshmellow math book is a great place to begin, and cheap
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