That is an interesting question. (I am not a CI user.)
I am pretty sure the implanted wire in the ear is just the same design for all CI hearing aids. I am thinking that she might try to ask her audiologist if she/he is willing to offer her a free trial with different brands of hearing aid so that she would compare the different quality of sounds for each one. Don't you think that it is a good idea?
Don't expect hoping that she would find a better CI that will work for her because of her speech. After that, it is more likely for her to go to a speech therapy to improve her speech with a better CI.
If her audiologist cannot offer her one, then she needs to stick with her CI and don't give up attending to a speech therapy. I am sure that her speech will be greatly improved.
