There seem to be a lot of errors associated with Supergirl covers from SDCC this year.
Action Comics #1100H is not a foil.
Summer of Supergirl Special #1
#1G and #1H, FanExpo covers by Alexander Lorzano, likely refer to these two covers, which are foil variants of the Summer of Superman Special #1 from last year. However, they are actually Supergirl, vol. 8 #15. Possibly one is in CLZ as #15I:
Pink Foil Variant
Front
Back is similar to color splash back; upc ends in 1571
Color Splash Foil Variant
Front
Back
#1I by Alex Ross does not exist as it was not approved by DC.
#1K by Alex Ross does not seem to exist, or at least was not released at SDCC.
Supergirl #15G does not exist. It would appear that an image of #15F was released without the trade dress, but only the trade dress was released along with the spot color virgin foil (#15H).