To suggest that a baby doesn't deserve rights until it's no longer inside a woman's body, doesn't mean that you agree with women doing anything stupid and almost certainly harmful to their unborn baby... it just means that there is no other way to deal with it, other than to understand that to give that unborn baby rights mean you're taking away the rights of a person who is only having those rights stripped of them BECAUSE of that baby.
As for being shipped off to some sort of facility, I think that a drug-addicted pregnant woman or a severely mentally ill pregnant woman should be treated the same way she would be if she wasn't pregnant. I believe that under the mental health act, people who are at risk to themselves can be held against their will, but whether or not a woman is pregnant should not come into it. If she is at risk of harming herself, she should be detained. If she happens to be pregnant, then fine, I suppose holding her will mean that her unborn child is less likely to suffer as a result of decisions made while in a state of terrible mental health.
A woman going out for a bender is risky, but it is not something that you can be arrested for (unless you do something stupid while under the influence, of course), and it should remain that way for pregnant women also. Yes, it's a bad thing for her to do. Yes, it's not ideal for the foetus she is carrying. However, when we strip her of the rights all her fellow humans have, we are reducing her to nothing more than a vessel, an incubator, and no woman should ever be reduced to lesser because of that. No woman should ever feel if she falls pregnant, her body is no longer her own and that the state owns it more than she.
That's not a good place for any woman to be, and we've fought to get out of that kind of place. I don't think it would be good for ANY woman to return to the days when a woman's body was never her own - it was her fathers, her husbands, and used pretty much exclusively for baby-making.
I want much more for my daughter than to choose between being childless and full of rights, or a mother, and stripped of any rights the minute a pregnancy is confirmed.