I would like to do the Senegalese on my daughter's hair, can I cut the hair in half?

You could try it, but the ends do look different from the mid-shaft on these, so you'd likely need to cut both ends and make them more blunt. They have a natural taper at the tips. Plan on sealing them too as I'm not sure if they could be cut without unraveling. I would suspect they would be okay, but I haven't tried it.