There's no way you could morph the feet to be like Jessi's. That's not just a change in mesh shape. That's a difference in rigging. Jessi has bones in her individual toes. Vicky does not.

Perhaps V4 will have posable toes.

You might be able to frankenstein Jessi's feet onto V3, but then you'd have the problem of textures. (Though perhaps you could use nodes to fake a texture, at least for her skin.)

Your best bet might be to use Judy. There aren't a lot of high-res textures for her, but she can take V1 or V2 textures (except the eyes).