most helpers are like that so for new maid, you should set down all the rules that you need her to observe, eg not to go out except with your permission, not to let friends inside house except with your prior permission etc and ask her to sign. If she is in breach of these conditions, then you should give them warning letters and terminate the contract if not corrected (without compensation) as this is a very serious breach of the employment conditions.
U are very brave and meanwhile if there is no helper, find a part time and take your time to find a new and real good one.
Pl also post the details of the maid so that other moms can take care.