While I don't know who made that above image, I can tell you it's a photoshop that uses the below Anovos replica stock photo as a base. It's not a literal prop picture but it is a relatively well done photoshop replicating the look of her saber.
It very well illustrates that Rey's saber is literally the end of her staff removed and flipped upside down.
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And we can also surmise the size of the hilt because of the measurements of the staff. The staff is 6 feet long. The part used for the hilt is almost exactly 1/6 the length of the staff, meaning this hilt is ~12 inches long.
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Which is 1 inch longer than the classic Skywalker hilt.
I had done this below comparison earlier purely for illustration purposes. The wrap and the teeth are not screen accurate, just put in to illustrate the point that it is literally her staff.
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There are some minor differences between the staff prop and the saber prop (a couple angles, measurements, and those little holes) but it's clear the intention is for this to be made from the same gear.
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