IDK, if she ever does comeback, i'm not sure if they will once again do the villain thing only because it would be repetitive at this point but the MCU is always surprising us so...

At least Lizzie said in the interview that she would like a redemtion but she doesn't have any power over what Kevin Feige wants sadly.

Also i don't know about how many stories are left, they basically did the whole Disassembled thing in MoM, unless they mean HoM as Wanda depowering mutants as another story, i hope they mean something like The Witches Road, were Wanda is magical detective.