Are these names too close for twins?

Yes. Imo, all of those sets would not be good or twins or any type of siblings b/c they are too matchy. Twins share enough as it is and have enough trouble erting their individuality and not being seen as a box set without matching names that make them appear even more like a set. There is nothing wrong with any of those names. I just think she should switch them up a little bit into sets that are not so matchy.