I had a baby at 16, my parents were obviously less than happy (I wasn’t over the moon either!). Continued living at home, finished my A levels, worked whilst doing degree and Masters, and my child is now in their 20s. It is doable but your daughter will need your support.
good for you. Who gave you support? your parents? how much did it disrupt their plans for their life while you blithely went on doing exactly what you wanted and they supported you? How have you thanked/repaid them?
OP, I think you need to be very very clear with your daughter about what you are and more importantly are not prepared to do. And keep being very clear. If my daughter told me she had a good support network and not to patronise her, I'd ask her to outline it to me. And it isn't enough to have a plan for childcare etc, as we all know, you need Plan B, Plan C and right through the alphabet. You can support your daughter with things like keeping a roof over her head but the baby will wake you at night. Are you prepared for that (are you menopausal or likely to be soon? that can give you awful insomnia anyway, add a screeching baby in the night and you may feel as though you're losing your marbles)
What is she going to do during the uni vac? When her child goes to school what is she going to do for childcare?
As for her boyfriend, i feel bad for him but he should at least be paying towards things for his child. If you have sex a baby might be the result. he must step up. do you have a husband/partner? how does he feel?