Thank you so much guys! Cupcake is right along track, hopped into my hand a little bit today and munched two sunflower seeds. She finally tested it with a forceful nibble, and no bites at all!
Really happy with how quickly she's settling in, all the tips I've gotten on here with Pearl have helped out make this a good start for Cupcake 3 days in. It's great to see her out and about during prime hamster hours.
I was able to get her to hop on a second time before bed, here's some footage. It came out a bit dark, but she's a sweetie:
Hand Time!