I think if you go back and reread your post you will see you want to punish her for being scared- not to mention that you have been neglectful in her physical needs---
I am hoping you will realize how sensitive we will try to be here.... Could we maybe walk you thru getting her help?
YOUR FIRST STEP IS TO GET HER TO A DOCTOR and tell them all your concerns especially see to the baby she may be carrying-- let us know when you have done that and we will walk you thru the next step.
i don't think punishment is the answer here. If she attempted to commit suicide a few years ago (I assume you meant attempted...) then she clearly has emotional problems.
There are several problems here. First of all, if she had pneumonia (i assume that's what you are trying to spell), then it is neglect to not take her to the doctor for proper medications. Secondly, by claiming that you are too busy to take her to the doctor you are sending her a clear message that she is not a priority in your life. If i were her, i wouldn't go to school either. She is crying out for help and you are not giving it to her. Instead you are going to take away one of the only things that probably helps her feel involved- theater group.
Sending her back to school when she is so behind without any support is only going to continue sending her in to a downward spiral. You need to contact the school and ask for help. She needs extensions for assignments and tutors. She needs someone who will listen to her concerns and fears instead of punishing her. I believe her when she says she can't do it anymore. She needs help. Support her. Get her help.