Just calmly explain to her that education is very important and her chances for a good life will be null. Maybe pregnancy inamsumbua or she feels ashamed to be in school with pregnancy. How far along is she? She can still go back after she has given birth. Remember that you are dealing with a very emotional person bcz of pregnancy hormones, mbebeleze tuu. And talk to the mom. Children are a blessing, it should not be the cause of problems. If you join forces with her mom and just talk to her nicely and find out if she is ashamed of going to school bcz of her condition, you can encourage her and she will go back to school. Try to avoid being harsh and taking drastic decisions, this is her first pregnancy and she is very young. She is going through alot. Stay calm and talk to her and the mom about the importance of keeping her in school. I once had a lady with 3 kids wanting to quit her job bcz she fought with her husband, she was pregnant so she wasn't thinking straight. Avoid quarrels. Just stay calm and insist that she can't stop schooling. If she is almost due, she can drop out for few months and go back, she'll catch up and her mom will help her raise the kid. Avoid extreme ideologies like MGTOW you should not abandon your own child for any reason.