But even more, I have a particular hankering to see her in earlier times e.g. the Wild West (perhaps singing “Buttons and Bows” in the saloon!); taking HG Wells to do research on the moon; taking Wendy’s place in Neverland (Supergirl and Tinkerbell!); helping Isaac Newton with the theory of gravity!; supporting “witches” in Old Salem ).
I think an SG/Legends mini-crossover would be a riot. And that first suggestion, the Old West motif has been tried time and again...with the appearance of Jonah Hex. Have Melissa singing Buttons and Bows (an Oscar winning song from the 1947 Bob Hope/Jane Russell film "The Paleface" [by the way, if you have seen pictures of Jane in her youth and prime, she would have made quite the Wonder Woman had a film serial been made of her]) would be a riot.
LofT's third season was full of wit, whimsy, fun and fights. If SG gets one of my wishes, a lighter tone, this would work.
Going on that theme, if say Kara, Sara and Zari have to ride horses, I would have Kara say to Sara in such giddiness, "I've always wanted to say this.: Sara asks "What?"
Kara then yells out...HI YO SILVER, AWAY! Then let Blake Neeley have at it with the William Tell Overture, which was The Lone Ranger's theme song!
The other thing which would make sense...Isaac Newton. Supergirl would defy gravity and Issac could not believe it.
I suspect her presence and powers would be even more astonishing to our forefathers.
Hmmm...maybe she can also work with Betsy Ross or Martha Washington. Of course she would also know about fighting for "Truth, Justice, and the American way."