S., welcome to my life! My oldest, now 10, has never been a sleeper. I know you are exhausted, but I suggest making it all as easy on yourself as possible by changing routines to reflect the reality. If that means you give up and put the baby in your bed, so be it. You need as much sleep as you can get! When you realize you have a child that doesn't conform to the expectations of those around you is also when you are free to realize that listening to their advice is worthless, and you are completely free to forge your own road. A burden and a blessing, really, but it is what it is.
Some things to watch for:
If she does start sleeping for longer periods, be ware of the possibility of regression. This is common. But, with a nursing baby, what you do NOT want is for her to get in the habit of eating at those times again. So, at that point, make sure it is daddy who tends to her. If it's you, she'll want the comfort of the breast, but she shouldn't need it (we didn't do this ourselves, we didn't know about it, we thought he was hungry, but the baby really shouldn't be).
She should start sleeping through the night eventually, just not on the schedule other babies did it. Keep everything flexible, so that you can take advantage of it as soon as she is ready.
Be sure you sign up for a preschool that doesn't require a nap period. That would be asking for trouble.
--
The thing about children is they are who they are and there is no formula that speaks to every child. Long run, there are huge advantages to being someone who runs on less sleep: most great leaders in business and politics have been that way. Simply put, when you sleep less, you have more hours available in your day. So, some day, this will be an asset for her.
But you still have to survive her infancy and toddlerhood. Sigh. It isn't easy. I know it.
Best of luck.
PS - Since my second child sleeps like a textbook, I can say with 100% certainty, now, that my son's sleep habits had NOTHING to do with my parenting. It really just "is" the child, in almost all cases, I believe.