Internally I would be absolutely heart broken for her, because I was a teenage mum, I know the judgement that will open her up to. I have spent her entire childhood trying to show her that life is about so much more than struggling, which is all most teenage parents come to expect of their lives that I’ve known.
I’ve given her nice things, and she’s known that she could enjoy those things for herself, and establish herself to the point where she can provide financially for 2/3/4 people before actually having to do so, so there’s never a choice between having things for herself or her children going without (it’s not the case for us now, but it was for the first 6 years or so of her life, she always had but I didn’t)
Outwardly, there would be a lot of support from me, of course she would have to finish school, I would obviously provide childcare whilst she finished school. I would want to keep her as close as possible, I wouldn’t be able to let her move out at 16/17 with a young child as I would want her to have the ability to build a life for herself, instead of struggling and getting herself into debt or deal with even more responsibility at that young age.
I would support her, and she would hopefully attend a nearby university and gain a degree, and leave home a few years later when she has the ability to start her life in the same circumstances as other adults.