One thought comes to mind. Do you think that this woman ever felt any real love for your daughter? Seems to me that, when she got pregnant she saw that as a bargaining tool to hold over your head with not a thought to the damage that her habit might do to the child she was carrying.

So far as her job is concerned, from the irresponsible way that she has behaved with your daughter it is highly likely that she will be found out at work, perhaps after causing harm to a patient. At that point it is likely that she will be dismissed, particularly if she does not have you to run interference for her this time.

I doubt that your daughter will really be more ashamed of having a prostitute for a mother than a drug addict. Her major problem may be that her mother left and didn't take her and that you need to be aware of.

From your point of view - and this may sound hard - the further this woman goes down the better are your chances of retaining custody of your daughter. As has been previously stated - you must consider what is best for you and the child. This woman has chosen her own path, in spite of the responsibility she was given as a mother and the only person that can change that is her.