flapjack my post wasn't really pointed at you, but there is a risk, identified before, of those who can parent these children well thinking anyone can parent these children well. Probably because you're all such lovely humble people!
gingerh4ir I'm sorry some friends have shown themselves to be not good friends. It must be hard on your DD, and you, that she can't do what others can. However, hopefully she's learning empathy, and skills, and resilience, that will stand her well in life. I bet you wish she didn't have to, but the adults I know why grew up with a disabled sibling have a real kindness in them that shines.
Not everyone can manage. And those who say 'if it's a birth child, you just cope', actually, a lot of families don't. Which is why many end up in care, or residential services etc. Add adoption issues in, and it could be impossible.
Plan for the worst, hope for the best, OP. If you think you can cope with the worst case scenario the medical advisor has painted, then go for it. But if you can't, there will be other parents that can, don't feel guilty.