poor you... I advise the following-
1. DO NOT under any more circs lend her any more money. Not till she's paid back every penny she owes you both.
2. Persuade your husband this is going to damage your relationship if you stay much longer...rent anything, even a room in a house, live in a tent if necessary, but move out as quick as you can.
3. Your husband loves her, I'm sure, but he must not let her walk all over both of you, and must assert himself and tell her that although he loves and respects her the present situation is not working. Give her one week to change her behaviour and leave without further debate if nothing gets better.
Good luck, support and look after each other and let us know what happens.