This is Yume, my Hujoo Action Doll Sara.
I don't have any high heels in this size, so I used Hazel's glass slipper. As you can see, she could wear high heels. Because the shoes are clear, you can see just how this works. If I stuffed the toes on these, she could wear them. They are Obitsu 60cm high heels. They are too small for my resin 60cm girls, by a bit since Obitsu have smaller feet. Half the time I use MSD shoes for Hazel and the girls. (Alerich refuses, even though they do fit him) The shoes should fit, and they really look cute on Hyacinth!
Fennix (48cm Obitsu) helped out by wearing the other shoe of the set for comparison. As you can see, their feet are similar in size with Fennix having slightly longer feet, but not wider.
Finally, Yume shows off by standing unsupported in the shoes. You can see her feet wanted to slip forward a little, but not that badly and remember that these are actually a little too big for her. Hyacinth's boots would be perfect!