sassyferu
She is too far along to get an abortion so she has to keep it or give it up for adoption
That varies by the laws and is incorrect. She is still in the first trimester if she chooses that route and acts accordingly, she can get one. Please do not give false information.
Wotfan is right, she needs some time to cool off, it's certainly understandable your mother being angry. Is your father in the picture? What about the baby's father? I would inquire about the age of the baby's father for legal reasons, there is potential problems with that as well.
Is there another adult you can sit down with and talk it over about what you plan on doing?