If AG had KEPT Felicity's hair that bright color it used to be, then she wouldn't "look too much like Elizabeth" now.

Felicity's current hair is almost brown...of course she will look like Elizabeth!
If they kept Felciity's original color, bright red, then she would look more different from Elizabeth's dark brown hair.

Maybe instead of changing Elizabeth, they should put Felicity back how she was originally...

You go from a bright-red haired Felicity with a dark-brown haired Elizabeth....to a dark-red haird Felicity and a blonde Elizabeth...I like the first version better..