I think asking them to move will inevitably seemedseem rude. However, you could still address the whispering issue.
I suggest being up front. ExplainingExplain to her that you have an hearing condition. That, and that you don't mind her speaking out loud. However, whispering is very disturbing to you. Then, ask her if it would be possible for her to stop whispering and use her regular tone of voice instead.
Be polite and charming (smile), go to the point, choose thea good time to talk to her (when she arrivearrives in the morning maybe?).
You may start the conversation bywith something like:
It's been a while since II've wanted to talk to you about something for a while...
If she agreeagrees to stop whispering but then does it anyway in a conversation, just friendly remindgive her a friendly reminder of your hearing condition (after five minutes or when the person she was talking to leaves).