Unwanted guest - how do I make her leave without directly telling her to get out?

You don't have to be rude, you can say something like how long are you planning on being with us? or when are you going to start looking for your own place? Of course if it was me I'd say let's go. when she say's where I'd say to help you pack, your moving. Sometimes moochers will purposely ignore hints,and then you have no choice. Also your husband should step up and be a man. he is technically the head of the house. If he sees you are unhappy it's his job to defend you.