Let's see, if we guess that Jublieus' fist is as wide as Bayo is tall, then if an average woman is 5'6 (168 cm, lets say 170), and their fingers span maybe 4-5 (lets say 5) cm across, then the ratio of height to fist width is 34 times. Bayo is 7 feet including hair and heels, so Jubileus is ~240 feet tall.
From the instant she gets punched, Jubileus is as tall as Sheba's fist, the ratio here is, lets say 4cm to the height of 170, or 42.5. So, we could estimate Sheba's height to be ~10 000 feet, or more if she's abnormally tall and thin like Bayo is (which, of course, Jub and Sheb both are). So 10000 feet is a conservative guess.