Oh yes. Its all very new for her, and such a big change. But soon enough it'll become normal and she really won't remember a time before dd2. And remember, babies are pretty damn dull for the first weeks (apart from to us parents), she'll be much more engaged when dd2 starts smiling and responding to her...and growing and becoming her own little person.
You sound so lovely as a mum, you care so much about dd1, and are thinking so carefully about how she feels. This is the best foundation for her. She knows you care about how she feels, and that will give her such an amazing start in life. Challenges are thrown up all the time, but that foundation of care and consideration of her feelings will give her such an advantage, she knows she counts and her feelings matter, you are teaching her how to manage those feelings, even if they are hard. I guess the difficult balance is the acknowledgement of them, without giving her the sense they are overwhelming or wrong. I think you are striking exactly the right note.
I only mention the dyspraxia, because that is what ds has, it does not mean dd1 has it, or that I think she has, its simply there are some parallels, and I know how tricky it can be to parent a really sensitive child, because you care so much about them (and I think, you, like me, were also very sensitive as a child, and so can utterly relate to her feelings) but part of being an aware parent is that you know what that feels like, and can help her manage it. Just by acknowledging her feelings, you are probably doing so much more than our parents ever could, because we think about it so much more.
Phew! I guess I am saying, don't worry overmuch...she'll be fine with the fab parenting you are giving her. And if, and it only is an if, there is something else, such as dyspraxia, then you will also manage that fabulously too.
Being sensitive is an amazing gift. Though it often feels like a burden if one's parenting has been lacking, You are doing all the right things to make her feel her specialness, rather than feeling wrong. You can't change who she is, and nor would you wish to, but I really really think sensitive children, while not being as robust as others, offer so much to their peers and the world, and as long as they are cherished and celebrated at home, they can learn to face the world and its challenges with reasonable equanimity and eventual triumph.
Whenever I feel a bit down about ds, I remember just how loved he was by his very rough and tumble peers at a challenging London primary...they really responded to his kindness and gentleness...even a couple of years later (such a long time in little peoples lives) when I meet his old class mates in the street, they still beg for news of him, and say they want him to come back.
Oh dear, a bit of an essay! You know what I mean, though!
Go girl!