Thanks for the heads up.  I won't bother with the experiment then.

I DID find the "Detect Existing Accounts" button mentioned by Neurotic Fish.  So I went back and entered the 12 word seed and clicked on that button.  It found the "account 0" and of course when I loaded the wallet it had my sisters history of her tx's in it and a zero balance.  So then I entered the 24 word seed and clicked on that button.  It found nothing!  No accounts detected.  And when I loaded the wallet there was absolutely NO TX HISTORY and the wallet was empty. So that left me scratching my head because I thought we had seen the tx history in electrum with their 24 word seed.  I went back through the restored electrum wallets I had open and the one that has the history in it for the 24 word seed is the one that I restored as a HARDWARE WALLET using the trezor attached to Electrum.  The trezor of course having been restored with the SAME 24 word seed.  This is a little baffling to me because I clearly remember when I had suggested to my sister that she restore her seed using the Electrum wallet.  Her and her husband did that and I remember them exclaiming that it had all their tx history in it.

Anyway, the Detect Existing Accounts did not detect anything that I haven't already restored.  I'm still not clear on why the trezor has their account tx history and my restoration of the same seed phrase in Electrum does not???  I did choose BIP39 for the seed type.