I am not asking a free seat for her. I and my wife have no status. My questions is.. I am planning to give my daughter a silver medallion, in this case I can add miles on my KE account and get two free bags from her DL account.

When my wife flew internationally with my daughter as a lap child, my wife was told she could check 4 bags (2 bags for my wife and 2 bags for my daughter)

Of course, I had to pay 10% of the fare for a lap child (fly international)

Not sure what is the rule for domestic flights.