R, darling,
What difference does it make? How does this affect your life?
Who cares what some other mom does? Is it your sister? Even if it's a family member, if she hasn't asked for your advice, don't share!
A child can't be enriched much beyond what their 'Headmeat' is able to take in. Justing having a Mom who wants to put that much energy into teaching their child at this early age is a pretty good sign of having a 'brighter than average' Mom, which generally correlates with a 'brighter than average' baby.
Part of being a good mom is to be 'tuned in' to baby and open to what baby likes to do. Not all of us are equally talented in this area. But even if we mess this up, if we are sharing a part of ourselves with out child, then that is good too. Some folks make mistakes, and put too much emphasis on only one area. I think the 'not tuned in' can be a problem, but that it is in the area of academics can't be - there is no way to put 6oz. of water in a glass that holds 4oz.
Best Wishes,
Grinity
This is all my opinion - no scientific proof at all.